Question

Four people come to a river in the night. there is a narrow bridge, but it can only hold two people at a time. they have one torch and, because it's night, the torch has to be used when crossing the bridge. person a can cross the bridge in one minute, b in two minutes, c in five minutes, and d in eight minutes. what is the minimum time that they all cross the bridge.

Answer 1

2 min 
i hope it is correct