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One automobile starts out from a town at 8 a.m. and travels at an average speed rate of 60mph. 2 hours later, a second automobile starts out to overtake the first. If the second automobile travels at an average rate of 80mph, how long will it travel before it overtakes the first?

 Sep 4, 2021
 #1
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The second automobile travels 5 hours.

 Sep 4, 2021
 #2
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First auto has a   2 x 60 = 120 mile headstart

 

Closing speed of the second auto is  80 - 60 = 20 m/hr      it will take    120 m / 20 m /hr = 6 hours to catch the first auto

 Sep 5, 2021

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