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Two cars are 750 miles apart. Car A is traveling towards car B at 70 miles per hour, at the same time car B is traveling towards car A at 80 miles per hour. How long would it take the two cars to reach one another?

 

A. 4 hours

B. 5 hours

C. 7.5 hours

D. 10 hours 

 Sep 8, 2018
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not a terribly well worded question.  I'm going to assume the stated speeds are with respect to a stationary object on the ground.

 

Given that the resultant speed of the two cars approach is

 

s=70+80=150mph

 

t = d/s = 750miles/150mph = 5hr

 

choice B

 Sep 8, 2018

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