Raghu starts round a 600 m track at 5 m/s. Forty seconds later Sohail sets off from the same point in the same direction at 7 m/s. How many seconds after his start does Sohail catch Raghu?

Question

Accepted Answer

100 s. Raghu's lead =5×40=200 m. Sohail gains 2 m/s: 200/2=100 s. (140 s counts from Raghu's start; 300 s chases a full lap.)

Raghu starts round a 600 m track at 5 m/s. Forty seconds later Sohail sets off from the same point in the same direction at 7 m/s. How many seconds after his start does Sohail catch Raghu?

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