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A train is 125 m long. If the train takes 30 seconds to cross a tree by the railway line, then the speed of the train is:
- A14 km/hr
- B15 km/hr
- C16 km/hr
- D12 km/hr
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CCommunity
By given data-
The train takes 30 seconds to cross a tree.
∴ When a train crosses a stationary object, it essentially travels a distance equal to its own length.
∴ In this case, the train took 30 seconds to cross 125 meters.
? distance traveled = speed × time taken
⇒ 125 = speed × 30
⇒ Speed = 125/30 m/s
⇒ Speed of train $(= \;\frac{{125\; \times \;3600}}{{30\; \times \;1000}}\frac{{km}}{{hr}})$
⇒ Speed of train = 15 km/hr
The train takes 30 seconds to cross a tree.
∴ When a train crosses a stationary object, it essentially travels a distance equal to its own length.
∴ In this case, the train took 30 seconds to cross 125 meters.
? distance traveled = speed × time taken
⇒ 125 = speed × 30
⇒ Speed = 125/30 m/s
⇒ Speed of train $(= \;\frac{{125\; \times \;3600}}{{30\; \times \;1000}}\frac{{km}}{{hr}})$
⇒ Speed of train = 15 km/hr