Question

A train, 150m long, passes a pole in 15 seconds and another train of the same length travelling in the opposite direction in 12 seconds. The speed of the second train is

• A. 45 km./hr
• B. 52 km./hr
• C. 48 km./hr
• D. 54 km./hr

Answer 1

Answer:

D. 54 km./hr

speed of the first train =150/15 =10 m/s time taken by trains to cross each other=12sec. Relative speed of two trains = [150+150]/12= 25 m/s Speed of the second train =(25−10)×18/5= 54 km/hr.