Kiwi BridgeCrossing

It is night and there is only a all torch, that will go out soon. The Kiwis want to cross the Bridge, but only two of them can go at once.They have different speeds and if two of them walk together, they walk at the speed of the slower Kiwi.It's too dark, so the Kiwis need the torch when walking over the bridge.But in result the bridge can only be crossed from the side, where the torch is currently located.Help the Kiwis to cross the bridge before the timer runs out!This app displays the bridge and torch problem.http://en.wikipedia.org/wiki/Bridge_and_torch_problem