<PRE><B>Question 928018</B>
s = d/t
d = st
t = d/s
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speed of A relative to B:
s = 20 - 15 = 5 mph
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distance traveled by B when A departs:
d = 15*3 = 45 miles
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time traveled by A when he catches B:
t = 45/5 = 9 hours
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distance traveled by A when he catches B:
d = 20*9 = 180 miles
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