Question

A cart travels a distance d on a straight road in two hours and then returns to the starting point in next three hours. Its average speed is:

• A. $\frac{d}{5}$
• B. $\frac{2d}{5}$
• C. $\frac{d}{2}+\frac{d}{3}$
• D. none of these

Answer 1

The correct option is B $\frac{2d}{5}$

Average speed $=\frac{totaldistance}{totaltime}$

So, total distance = d+d = 2d

and total time = 2+3 = 5 hours

Then Average speed = $\frac{2d}{5}$

hence (B) is the correct answer