Question

A car travels from a to b with a uniform velocity of 30km/hr and returns back with a uniform velocity of 40km/hr .Find the average velocity and the average speed of car if the distance ab is 120km

Answer 1

average velocity = s/(u+v)
=120/70
$average \: velocity = \frac{2uv}{u + v}$
$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 2400 \div 70$
=34