A Rickety Bridge Riddle
Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?
Hint:
17 mins.
The initial solution most people will think of is to use the fastest person as an usher to guide everyone across. How long would that take? 10 + 1 + 7 + 1 + 2 = 21 mins. Is that it? No. That would make this question too simple even as a warm up question.
Let's brainstorm a little further. To reduce the amount of time, we should find a way for 10 and 7 to go together. If they cross together, then we need one of them to come back to get the others. That would not be ideal. How do we get around that? Maybe we can have 1 waiting on the other side to bring the torch back. Ahaa, we are getting closer. The fastest way to get 1 across and be back is to use 2 to usher 1 across. So let's put all this together.
1 and 2 go cross
2 comes back
7 and 10 go across
1 comes back
1 and 2 go across (done)
Total time = 2 + 2 + 10 + 1 + 2 = 17 mins Did you answer this riddle correctly?
YES NO
The initial solution most people will think of is to use the fastest person as an usher to guide everyone across. How long would that take? 10 + 1 + 7 + 1 + 2 = 21 mins. Is that it? No. That would make this question too simple even as a warm up question.
Let's brainstorm a little further. To reduce the amount of time, we should find a way for 10 and 7 to go together. If they cross together, then we need one of them to come back to get the others. That would not be ideal. How do we get around that? Maybe we can have 1 waiting on the other side to bring the torch back. Ahaa, we are getting closer. The fastest way to get 1 across and be back is to use 2 to usher 1 across. So let's put all this together.
1 and 2 go cross
2 comes back
7 and 10 go across
1 comes back
1 and 2 go across (done)
Total time = 2 + 2 + 10 + 1 + 2 = 17 mins Did you answer this riddle correctly?
YES NO
Salvador's Breakfast Riddle
Hint:
A Friendly Brain Riddle
Hint:
Vacation On The Brain Riddle
Hint:
The Singing Brains Riddle
Hint:
Broken Brain Scanner Riddle
Hint:
Massachusetts On The Brain Riddle
Hint:
Spongey Brains Riddle
Hint:
Lord Of The Rings Movie Riddle
Hint:
A Large Brain Riddle
Hint:
Easter Bunny's Breakfast Riddle
Hint:
Barking At The Door Riddle
If your dog is barking at the back door and your wife is yelling at the front door, who do you let in first?
Hint:
The dog of course ... at least he'll shut up after you let him in! Did you answer this riddle correctly?
YES NO
YES NO
The House With No Doors Riddle
Hint:
A fish. A fish bowl or aquarium is the fishs house and the people inside are the decorative divers that offer no reply (one might ask how the fish knows, given that they arent a talkative bunch themselves). Did you answer this riddle correctly?
YES NO
YES NO
The Fire He Breathed Riddle
Theres one that is called Smaug
Who in The Hobbit guarded gold
The fire that he breathed
Means that you would never be cold
What is it?
Who in The Hobbit guarded gold
The fire that he breathed
Means that you would never be cold
What is it?
Hint:
Five Bridesmaids Riddle
Five bridesmaids threw a shower for their bride. Each brought a gift and made a favorite food of the bride. They all arrived at different times, and during the wedding each was wearing a different color of her choice. Determine the gift and food each bridesmaid brought, the time she arrived, and what color she chose for her dress.
1. The bridesmaid with the painting had trouble getting it in her car, and the bridesmaid with the potato salad got lost on the way, so they were the last two to arrive.
2. Amanda hated the color green and potato salad.
3. Kourtney and Selena did not wear the blue dress and did not bring the turkey sandwiches.
4. Stacie arrived before the bridesmaid with the painting, but after the bridesmaid who brought the sheets, and the bridesmaid who made the cheese dip.
5. The bridesmaid with a blue dress arrived 10 minutes before the bridesmaid who brought the sandwiches.
6. The bridesmaid with the veggie tray arrived 25 minutes after the bridesmaid who brought flatware, but before the bridesmaid who would be wearing a blue dress.
7. The five bridesmaids arrived in the following order: The one who baked the cake, Amanda, the one who would be wearing a yellow dress, the one with a toaster for a gift, and the one who arrived last.
8. Selena brought a cake with green frosting, the same color as her dress.
9. Amanda brought pink sheets as a gift to the bride, but she did not like pink for herself.
1. The bridesmaid with the painting had trouble getting it in her car, and the bridesmaid with the potato salad got lost on the way, so they were the last two to arrive.
2. Amanda hated the color green and potato salad.
3. Kourtney and Selena did not wear the blue dress and did not bring the turkey sandwiches.
4. Stacie arrived before the bridesmaid with the painting, but after the bridesmaid who brought the sheets, and the bridesmaid who made the cheese dip.
5. The bridesmaid with a blue dress arrived 10 minutes before the bridesmaid who brought the sandwiches.
6. The bridesmaid with the veggie tray arrived 25 minutes after the bridesmaid who brought flatware, but before the bridesmaid who would be wearing a blue dress.
7. The five bridesmaids arrived in the following order: The one who baked the cake, Amanda, the one who would be wearing a yellow dress, the one with a toaster for a gift, and the one who arrived last.
8. Selena brought a cake with green frosting, the same color as her dress.
9. Amanda brought pink sheets as a gift to the bride, but she did not like pink for herself.
Hint:
Selena; green; flatware; cake; 2:50
Amanda; purple; sheets; veggie tray; 3:15
Kourtney; yellow; towels; cheese dip; 3:20
Stacie; blue; toaster; potato salad; 3:35
Stephanie; pink; painting; turkey sandwiches; 3:45 Did you answer this riddle correctly?
YES NO
Amanda; purple; sheets; veggie tray; 3:15
Kourtney; yellow; towels; cheese dip; 3:20
Stacie; blue; toaster; potato salad; 3:35
Stephanie; pink; painting; turkey sandwiches; 3:45 Did you answer this riddle correctly?
YES NO
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