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What is the speed of the train 400 m long which passes through a 200 m tunnel in 40 seconds ?


1. 36 km/hr
2. 38 km/hr
3. 44 km/hr
4. 54 km/hr

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Correct Answer - Option 4 : 54 km/hr

Given :

Length of train = 400 m 

length of tunnel = 200 m 

time taken = 40 seconds 

Formula used

speed = distance/time 

1 m/s = 18/5 km/hr

Calculation 

total distance = 400 + 200 = 600 m 

speed = 600/40 = 15 m/s 

Speed in km/hr = 15 × 18/5  = 54 km/hr

∴ The speed of the train is 54 km/hr.

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