Question

A boy completes a marathon of $40km$ in $4hours$. What was the speed of the boy?

• A. $5km{h}^{-1}$
• B. $8km{h}^{-1}$
• C. $15km{h}^{-1}$
• D. $10km{h}^{-1}$

Answer 1

The correct option is D $10km{h}^{-1}$

Given:
Distance covered = $40km$
Time taken to cover the distance = $4hours$

We know that, speed = $\frac{Distancecovered}{timetaken}$
$\Rightarrow$ $\frac{40km}{4h}=10km{h}^{-1}$