Question

A train $280$ metres 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

Distance $=280m$

Speed $=42km/h=42\times \frac{5}{18}=\frac{210}{18}=\frac{70}{6}m/s$ [$\because 1km/hr=\frac{5}{18}m/s$ ]

$time=\frac{\text{distance}}{\text{speed}}$

$=\frac{280}{\frac{70}{6}}$

$=280\times \frac{6}{70}$

$=\frac{168}{7}$

$=24s$