![]() There are only 17 minutes before the lava destroys the bridge. Two people crossing the bridge will travel at the speed of the slower person. Person #1 takes 1 minute, person #2 takes 2 minutes, person #3 takes 5 minutes, and person #4 takes 10 minutes. The people, suffering from different injuries, travel across the bridge at different speeds. Therefore, after 2 people cross safely, one has to go back to bring the flashlight back to the other side. Since it's dark, they must use a flashlight to cross. ![]() The bridge can only support 2 people at a time. There's a footbridge that spans the canyon. Four people, carrying only one flashlight, run for their lives. A volcano erupts in the dark of the night.
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