Riddle: Four band members are running late for a concert, their bus breaks down. they decide to take a shortcut through a forest. They come to a river and the only way to cross is by the bridge. The bridge can only hold two people at a time. They only have one flash light

one member of the band can cross the bridge in one minute, another can cross in two minutes, the third can cross in five minutes an the last can cross in ten minutes.

They have seventeen minutes to cross the bridge and for all of them to make it to the concert on time. How do they do it?
Answer: First, the one minute person and the two minute person must cross the bridge, for a total of two minutes. Then the one minute person should come back with flashlight - total of three minutes. The five minute person and the ten minute person cross together next, making the total thirteen minutes. Now the two minute person goes back and (total now fifteen minutes) and gets the one minute person and they cross together bringing the total to seventeen minutes.
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