Aptitude General Question Speed Calculation – Section 1

A train 125 m long passes a man, running at 5 km/hr in the same direction in which the train is going, in 10 seconds. The speed of the train is:

Explanation: Speed of the train relative to man = (125/10)m/sec = (25/2)m/sec. = (25/2 x 18/5) km/hr = 45 km/hr. Let the speed of the train be x km/hr. Then, relative speed = (x - 5) km/hr. x - 5 = 45 x = 50 km/hr.

A train 240 m long passes a pole in 24 seconds. How long will it take to pass a platform 650 m long?

Two trains of equal length are running on parallel lines in the same direction at 46 km/hr and 36 km/hr. The faster train passes the slower train in 36 seconds. The length of each train is:

A train running at the speed of 60 km/hr crosses a pole in 9 seconds. What is the length of the train?

Speed= (60 x 5/18) m/sec = (50/3) m/sec Length of the train = (Speed x Time). Length of the train = (50/3x 9) m = 150 m.

A train 360 m long is running at a speed of 45 km/hr. In what time will it pass a bridge 140 m long?

The length of the bridge, which a train 130 metres long and travelling at 45 km/hr can cross in 30 seconds, is:

Two trains are moving in opposite directions @ 60 km/hr and 90 km/hr. Their lengths are 1.10 km and 0.9 km respectively. The time taken by the slower train to cross the faster train in seconds is:

Two trains running in opposite directions cross a man standing on the platform in 27 seconds and 17 seconds respectively and they cross each other in 23 seconds. The ratio of their speeds is:

A train passes a station platform in 36 seconds and a man standing on the platform in 20 seconds. If the speed of the train is 54 km/hr, what is the length of the platform?