Multiple choice

A train 150 m long is running at a speed of 50 km/h. It take x sec to cross a telegraph post. Then the value of x is

  1. 10.8

  2. 10.5

  3. 11.1

  4. 12.4
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A Correct answer
Explanation

Speed = 50 km/h = 50 * 5/18 m/s = 125/9 m/s. Time = Distance / Speed = 150 / (125/9) = 150 * 9 / 125 = 6 * 9 / 5 = 54 / 5 = 10.8 s.

AI explanation

When a train crosses a stationary pole, the distance it covers is equal to its own length. Using the formula time equals distance divided by speed, the values are 150 m for distance and 50 km/hr for speed. First, convert the speed to meters per second by multiplying 50 by 5/18, which gives 125/9 m/s. Dividing 150 by 125/9 gives 10.8 seconds. The value of x is 10.8.

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