### A motorist travels to a place 150 km away at an average speed of 50 km/hr and returns at 30 km/ hr. His average speed for the whole journey in km/hr is.

**A.** 35 km/hr

**B.** 37 km/hr

**C.** 37.5 km/hr

**D.** 40 km/hr

## Show Answer

###
Answer-C

Solution-

__Solution(By Apex Team)__

$\begin{array}{l}\text{ Average speed }\\
=\left(\Large\frac{2xy}{x+y}\right)\mathrm{km}/\mathrm{hr}\\
=\left(\Large\frac{2\times50\times30}{50+30}\right)\mathrm{km}/\mathrm{hr}\\
=37.5\mathrm{~km}/\mathrm{hr}\end{array}$