Given: Speed of Rahul from A to B = 3 m/s Speed of Rahul from B to A = 2 m/s Speed of Sahil from A to B = 4 m/s Speed of Sahil from B to A = 1 m/s Distance between A and B = 1200 m Formula used: Speed =
Distance
Time
Calculations: Time taken by Rahul to complete whole journey = (
1200
3
) + (
1200
2
) ⇒ 400 + 600 ⇒ 1000 sec Time taken by Sahil to complete whole journey = (
1200
4
) + (
1200
1
) ⇒ 300 + 1200 ⇒ 1500 sec ∴ The time taken by Sahil and Rahul respectively is 1500 seconds and 1000 seconds.