Question

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

1. 40sec 
2. 50sec
3. 60sec
4. 80sec
5. None of these

Answer 1

Correct Answer - Option 1 : 40sec 

Given,

Ram and Shyam run at the speed of 40m/s and 20m/s respectively on the circular track of 800m

Calculations:  

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 and 40 = 40

Every 40sec they would be together at the starting point.

∴ The required answer is 40sec