A 240 m long train crosses a platform twice its length in 2 min what is the speed of the train ........

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A 240 m long train crosses a platform twice its length in 2 min. what is the speed of the train?

8 m/s

4 m/s

6 m/s

None of these

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Explanation:

To solve this question, we can apply a short trick appraoch
"When a train passes a platform or crosses a bridge it should travel the length equal to the sum of the length of train and platform or bridge both"
Speed of train = Length of train + Length of Platform /Required time
Given,
Length of train = 240 m,
Crossing time of platform = 2 × 60 = 120 sec
Length of platform = 240 × 2 = 480,
Speed of train = x
By the short trick approach, we get
Speed of train = 240 + 480 /120
⇒ x = 720 /120 = 6 m/s