Question

A bus takes $48$ minutes to cover a certain distance when travelling at a speed of $50km/h$. How much times will it take to cover the same distance when travelling at speed of $30km/h$?

Answer 1

Given, Speed $=50$ km/hr $=50/60=5/6$ km/min

Time taken by bus to cover distance $=48$ min

Distance$=speed\times time=48\times \frac{5}{6}=40$ km

$\therefore$ Time it will take to cover $40$ km at $30$ km/h

= distance / speed $=40/30$ = $\frac{4}{3}hrs=4\times 20$ min

= $80$ minutes.