Posted by Laura on Sunday, May 8, 2011 at 3:11am.
How far does the man run in 5 s? That would be 1.2*5 = 6 meters. You have to add that to 36 meters, which was the initial distance the dog was behind. That makes 42 m makeup distance.
The intervening distance gets reduced at a rate 3.1 - 1.2 = 1.9 m/s
The dog catches up after
t = 42/1.9 = 22.1 s
How far will the dog run?
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