Question

An athlete is running at 18 kmph alongside a railway track is 480 meters ahead of the engine of a 240 meters long train. The train is running at 90 kmph in the same direction. How much time does it take for the train to pass the athlete?

• A. 30 seconds
• B. 36 seconds
• C. 42 seconds
• D. 45 seconds
• E. None of these

Answer 1

The correct option is B

36 seconds

Distance to be covered = 480 + 240 = 720 m

Relative speed = 72 kmph = $\frac{72\times 5}{18}=20\frac{m}{s}$

$Time=\frac{distance}{speed}=\frac{720}{20}=36seconds$