P and Q run at the speed 40m s and 20m s resp on the circular track of 800m as its circumference whe...........

Quantitative Aptitude ( CCS) Time & distance

P and Q run at the speed 40m/s and 20m/s resp on the circular track of 800m, as its circumference , when would the P and Q meet for the first time at the starting point if they start simultaneously from the same point.

40sec

50sec

55sec

60sec

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Explanation:

Solution:
Time taken by P to complete one round
800/40=20
Time taken by Q to complete one round
800/20=40
LCM of 20 40=40
Every 40sec they would be together at the starting point.