Question

A car travels a distance s km on a straight road in two hours and then returns to the starting point in the next three hours. Its average speed in five hours (in km/h)

• A. $\frac{s}{5}$
• B. $\frac{5s}{12}$
• C. $\frac{2s}{5}$
• D. $Zero$

Answer 1

The correct option is A $\frac{s}{5}$

Total distance $d=2s$

Total time taken $t=2+3=5hrs$

Average speed $V_{avg}=\frac{d}{t}=\frac{s}{5}km/h$