Question

A train passes a telegraph post in 40 seconds moving at a rate of 36 km/h. Then the length of the train is:

• A. 400 m
• B. 395 m
• C. 500 m
• D. 450 m

Hint:

To find the distance covered by an object, use the formula \( \text{Distance} = \text{Speed} \times \text{Time} \), and remember to convert units appropriately.

Answer 1

The Correct Option is A

A train crosses a telegraph post in 40 seconds, traveling at 36 km/h. Convert the speed to meters per second: \[\n\text{Speed} = 36 \, \text{km/h} = \frac{36 \times 1000}{3600} = 10 \, \text{m/s}\n\] The distance covered by the train in 40 seconds is: \[\n\text{Distance} = \text{Speed} \times \text{Time} = 10 \, \text{m/s} \times 40 \, \text{s} = 400 \, \text{m}\n\] Therefore, the train's length is 400 meters.