SOLUTION: Sally is traveling 50 mph and Mark is traveling 65 mph. How long will it take Mark to catch up if Sally had a two hour headstart?

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Question 1110608: Sally is traveling 50 mph and Mark is traveling 65 mph. How long will it take Mark to catch up if Sally had a two hour headstart?
Answer by ikleyn(52787) About Me  (Show Source):
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One line solution 

How long will it take Mark to catch up Sally = %282%2A50%29%2F%2865-50%29 = 100%2F15 = 20%2F3 = 62%2F3 hours = 6 hours and 40 minutes.



Explanation.  The numerator 2*50 = 100 miles is the Sally's head start distance.


              The denominator (65-50) = 15 mph is their relative speed, i.e. the rate of decreasing the initial 100 km distance between them.

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