Four people went on a camping trip. They set up their camping ground and went to hike in the nearby woods. As the twilight shifted to night, these four campers made their way back to their camp and encountered the bridge they had crossed on the way to the woods.
Hiker A takes 10 minutes to get across the bridge;
Hiker B takes 5 minutes;
Hiker C takes 2 minutes;
Hiker D takes 1 minute.
Because the bridge is old, it can only have two people on it at a time.
Because it is night time, they needed to use the flashlight to get across the tattered old bridge. One person must run back over the bridge to give the flash light.
It is possible to bring all four campers across the bridge back to their camp grounds in 17 minutes. Do you know how?
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