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May 5th, 2018, 10:23 AM   #11
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$75~mph$ is incorrect.

$v_a(T-5) =(v_a-15)T = 450,~T>0$ is easily solved as

$v_a = 45~mph,~v_b = 30~mph,~T=15~hr$

so once again Ganesh has turned a simple problem into a extended discussion.
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