Problem on Trains
- A train 300 meters long passes a standing man is 15 seconds. The speed of the train is ?
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∴ Speed = Distance / Time = (300/15)
Correct Option: D
∴ Speed = Distance / Time = (300/15)
= 20 m/sec
= (20 x 18) / 5 = 72 km/hr
- The length of the train that takes 8 second to pass a pole where it runs at a speed of 36 km/hr is ?
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Speed of the train = (36 x 5)/18 = 10 m/sec.
Distance = (Time x Speed ) = (8 x 10 ) = 80 metersCorrect Option: D
Speed of the train = (36 x 5)/18 = 10 m/sec.
Distance = (Time x Speed ) = (8 x 10 ) = 80 meters
∴ Length of the train = 80 meters
- A train 280 meters long is moving at a speed of 60 km/hr. The time taken by the train to cross a platform 220 meters long is ?
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∵ Speed of the train = 60 x (5/18) m/sec = 50/3 m/sec
∴ Time taken by the train to cross the platform
= Time taken by it to cover (280 + 220) mCorrect Option: C
∵ Speed of the train = 60 x (5/18) m/sec = 50/3 m/sec
∴ Time taken by the train to cross the platform
= Time taken by it to cover (280 + 220) m
= (500 x 3/50) sec = 30 sec
- A train 250 meter long, running with a speed of 50 km/hr will pass an electric pole in ?
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∵ Speed of the train = 50 x (5/18) = 125/9 m/sec
∴ Time taken by the train to pass the pole = 250 x (9/125) = 18 secCorrect Option: B
∵ Speed of the train = 50 x (5/18) = 125/9 m/sec
∴ Time taken by the train to pass the pole = 250 x (9/125) = 18 sec
- A speed of 16 meters per second is the same as ?
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16 m/sec = 16 x (18/5) = 57.6 km/hr
Correct Option: B
16 m/sec = 16 x (18/5) = 57.6 km/hr