Question

Hariteja walked to his school at a speed of 4 km/h and returned on a scooter at 20 km/h. His average speed during the two-way journey is

• A. 20/3 km/h
• B. 8 km/h
• C. 6 km/h
• D. 12 km/h

Answer 1

Answer:

A. 20/3 km/h

her the distance is same souse the eqn

$average speed =\frac{2S_1S_2}{S_1+S_2}$

$=\frac{2\times 4\times 20}{4+20}$

$=\frac{160}{24}=20/3$