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by nitin_stmicro » Wed Mar 14, 2012 10:00 am
relative distance built up in the 5 mins = speed difference X (5/60) hr.
which is equal to 16 x 5/60 = 4/3 miles.

the hiker's speed is 4 miles per hour

so time required would be 4/3 miles divided by 4 miles per hour = 1/3 hour or 20 minutes.
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