Question

A train $350$ metres long crosses an electric pole in $28$ seconds. Find the speed of the train in $km/hr$.

Answer 1

Length of the train, $d=350m$

Time, $t=28$ second

$\therefore$ Speed of the train $=\frac{\text{Length of the train}}{\text{time}}$

$=\frac{350}{28}m/\sec$

$=\frac{50}{4}m/\sec$

$=\frac{18}{5}\times \frac{50}{4}km/hr$ [$\because 1km/hr=\frac{5}{18}m/\sec$]

$=\frac{180}{4}km/hr$

$=45km/hr$