Question

A 210 m long train crosses a man walking at a speed of 4.5 km/h in the opposite direction in 12 seconds. What is the speed (in km/h) of the train?

• A. 59.5
• B. 61.5
• C. 58.5
• D. 60.5

Answer 1

Answer:

C. 58.5

$4.5 kmph=\frac{4.5\times 5}{18}=1.25 m/s$

realative speed = train speed = man speed

relative speed$=210/12=17.5m/s$

$=17.5-1.25=16.25m/s$

$=16.25 \times \frac{18}{5}=58.5kmph$