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May 5th, 2018, 10:23 AM  #11 
Senior Member Joined: Sep 2015 From: USA Posts: 1,977 Thanks: 1026 
$75~mph$ is incorrect. $v_a(T5) =(v_a15)T = 450,~T>0$ 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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