A math puzzle, please help me ??

Question

A group of four people is trying to cross a bridge. it is dark and they have to use a flashlight is available. No more than two people can cross the bridge simultaneously and it takes different time for the people in the group to cross the bridge .Times for each person: 1 min, 2 mins, 5 mins and 6 mins.
how can the group cross in 13 minutes
Edit
1 Answer • Mathematics

Answer 1

I love this puzzle. I won't solve the whole thing for you, but here are a few hints:

 

a) 5 & 6 minute guys go over together, but they don't go first

b) 1 & 2 minute guys each go over a second time

Definitely draw a simple picture and maybe even make 4 little squares of paper labeled 1,2, 5 and 6,and then try different scenarios.

It's pretty cool once you get it!

Have fun,

Matt in New York