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A 290-metre-long train crosses a platform thrice its length in 29 seconds. What is the speed of the train (in km/hr)?
Question

A 290-metre-long train crosses a platform thrice its length in 29 seconds. What is the speed of the train (in km/hr)?

A.

144

B.

147

C.

138

D.

153

Correct option is A

Given
Length of train = 290 m
Length of platform = 3 × 290 = 870 m
Time taken = 29 seconds
Formula Used
Speed = Total Distance / Time
Conversion to km/hr = Speed in m/s × 18/5
Solution
Total distance covered = 290 + 870 = 1160 m
Speed in m/s = 116029=40m/s\frac{1160}{29} = 40 m/s​​
Convert speed into km/hr:
Speed = 40×185 40 \times \frac{18}{5}​​
Speed = 8×18=1448 \times 18 = 144​ km/hr
Final Answer
So the correct answer is (a)

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