Question

A train 280m long is running at a speed of 42km/hr. How much time will it take to pass a man standing on a platform

Answer 1

$time = \frac{distance}{speed} \\ \\ \frac{280}{42 \times \frac{5}{18} } = time \\ \frac{280 \times 3}{35} = time \\ \\ time = 24sec$
hope this will help you.