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Runner A can circle a track in 60 seconds, and runner B can circle a track in 65 seconds.  If they start at the same time, after how many seconds does runner A pass runner B?

 May 18, 2020
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Runner A   runs faster than B .....   every lap A gets closer to B

   Each lap takes A 5 seconds less than B        60 seconds/ 5 seconds/lap = 12 laps

   in 12 laps  B has taken  12 x 65 = 780 seconds        in 780 seconds  A will have run  780 / 60 = 13 laps    and will be at the same spot as B

   780 seconds

 May 18, 2020

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