state gov Kolkata Police SI Mock Test 2023 Quantitative Aptitude Speed Time and Distance Problem on Trains
A train 180 m long moving at the speed of 20 m/sec passes across a boy who is moving at a speed of 10 m/sec in the direction of the train. The time (in s) taken by the train to overtake the boy is:
1
15
2
36
3
18
4
12