Question

a car travels from a to b at a speed of 20km/h and returns at a speed of 70km/h. find the average speed and velocity

Answer 1

Rv= 2*v1*v2/v1+v2

=2*20*70/90=31.11kmph

Answer 2

20km×1000m/3600=5/9

50×70/9=38.461

please add in brain list