A train 125 m long passes a man, running at 5 kmph in the same direction in which the train is going, in 10 seconds. What is the speed of the train?

45 km/hr

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50 km/hr

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54 km/hr

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55 km/hr

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60 km/hr

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Solution

The correct option is B
50 km/hr

Speed of the train relative to man = $(\frac{125}{10})$ m/sec = $(\frac{25}{2})$ m/sec = $(\frac{25}{2} \times \frac{18}{5})$ km/hr = 45 kmph

Let the speed of the train be `x' kmph.

Then, relative speed = (x - 5) kmph

$∴$ x - 5 = 45 or x = 50 kmph.

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A train 125 m long passes a man, running at 5 kmph in the same direction in which the train is going, in 10 seconds. What is the speed of the train?

The correct option is B 50 km/hr Speed of the train relative to man = (12510)m/sec =(252)m/sec =(252×185)km/hr = 45 kmph Let the speed of the train be `x' kmph. Then, relative speed = (x - 5) kmph ∴x - 5 = 45 or x = 50 kmph.

The correct option is B
50 km/hr

Speed of the train relative to man = $(\frac{125}{10})$ m/sec = $(\frac{25}{2})$ m/sec = $(\frac{25}{2} \times \frac{18}{5})$ km/hr = 45 kmph

Let the speed of the train be `x' kmph.

Then, relative speed = (x - 5) kmph

$∴$ x - 5 = 45 or x = 50 kmph.