Question

A car travells from point A to B with a speed of 30 km/h and then returns back to point A with a speed of 50km / h . Find distance travelled and average speed of the car .

Answer 1

distance travelled cannot be calculated since the time is not given .

$avgspeed=\frac{2D}{{\displaystyle \frac{D}{30}}+{\displaystyle \frac{D}{50}}}=\frac{300}{8}km/h$