<PRE><B>Question 868443</B>
 A path is 4 miles long. A man walks from one end at the rate of 3 mph.
 At the same time, a friend bicycles form the other end, traveling at 9 mph.
 In how many minutes will they meet?
:
let t = time in hrs for them to meet
3t + 9t = 4
12t = 4
t = 4/12 * 60 = 20 minutes
:
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