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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:
1. 12 km/hr
2. 15 km/hr
3. 16 km/hr
4. 14 km/hr

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Correct Answer - Option 2 : 15 km/hr

Given:

Length of train = 125 m

Time to cross tree = 30 sec

Formula:

Time to cross the tree = length of train/speed of train

1 m/sec = 18/5 km/hr

Calculations:

S = D/T = 125/30 m/sec

⇒ (125/30) × (18/5)

⇒ 15 km/hr

Speed of train is 15 km/hr

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