A 150 m long train is running with a speed of 68 kmph. In what time will it pass a man who is running at 8 kmph in the same direction as that of the train?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 9 sec
When the train and the man move in the same direction, the train gains on him at the difference of their speeds. To pass him, the train must cover its own length at that relative speed.
Relative speed: \(68-8=60\) km/h
In m/s: \(\displaystyle 60\times\frac{5}{18}=\frac{50}{3}\) m/s
Time to cover 150 m: \(\displaystyle 150\div\frac{50}{3}=150\times\frac{3}{50}=9\) s