Middle School

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Two cars start driving around a 2 km track at the same time. Car X makes one lap every 80 seconds, while Car Y makes one lap every 60 seconds.

(a) How long will it take for the cars to be at their starting point again? Give your answer in minutes.

(b) How long will it take for the faster car to be ahead by 15 laps? Give your answer in hours.

Answer :

Answer:

20 minutes

Step-by-step explanation:

Both will meet again at start point after LCM(60,80) seconds.

That is 240 seconds.

in time slower car completes one lap, faster one covers 1 +20/80 lap, that is 1.25 laps. After 20 laps faster by slower car car will be 5 laps ahead, time =20*60 = 1200s = 20 minutes.

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