Four people need to cross a bridge at night.
They have one flashlight, and the bridge can hold at most two people at a time. Anyone crossing the bridge must carry the flashlight.
Their crossing times are:
Anna: 1 minute
Ben: 2 minutes
Chris: 5 minutes
David: 10 minutes
When two people cross together, they move at the speed of the slower person.
Can all four people cross the bridge in exactly 17 minutes? If so, how?
If u dont have to count the time for walking BACK over the bridge i think every time Anna walks bc only the time of the slower person counts. So: Anna walks with David = 10 and Anna walks with Ben = 2 and Anna walks with Chris is 5. 10+2+5=17. 🙂 Im not sure if u mean that but that way it can work. ORRR she can just throw the flashlight over the bridge and only David walks with Anna and after that Ben and Chris walk alone each time. 😇😇