Question

Four cars go round a racing track in 1 min 12 seconds. 1 min 28 seconds. 1 min 39 seconds and 1 min 48 seconds respectively. They started together. How long will it be until they all pass the starting point together again?​

Answer 1

Explanation:

It will be as long as the time taken by the car who is the most late which is 1 minute and 48 seconds until they all pass the starting point together again. So your answer is 1 minute 48 seconds.