Question

A train crosses a platform which is 120 m long in 14 seconds and the same train crosses a static pole in 8 seconds. Find the length and speed of the train.

A 162m,12m/sec Correct Answer Incorrect Answer
B 160m,20m/sec Correct Answer Incorrect Answer
C 112m,26m/sec Correct Answer Incorrect Answer
D 119m,21m/sec Correct Answer Incorrect Answer

Solution

Sol. Let the length of the train be x [if gte msEquation 12]>x [if !msEquation]-->[endif]-->metres. `x/8 = (120 + x)/14 rArr 14x = 960 + 8x` `6x = 960 :. x = 160m` [if gte msEquation 12]> [if !msEquation]-->[endif]-->`:.` Speed of the train = `(Distance)/(Time) = 160/8` = 20 m/sec.

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