Two cars moves around a circle of circumference 20 m with speed of 5m/s and 15m/s, if the positions of these cars are observed every integer seconds, after how many seconds will the cars occupy the same position.

Question

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Answer 1

the time for meeting is the time one has traveled distance d and the faster has traveled d+20

distance slower travels: d=5t
distance faster travels: d+20=15t

5t+20=15t
t=2 seconds, the slower car is halfway round, and the faster car has made it 1.5 around.