Question

a train covers 's' distance at the constant speed of 30km/h.Then it covers the same distance in opposite direction at constant speed of 45km/h,then it's average velocity would be ___km/h​

Answer 1

Explanation:

in short, put the formula

2*V(1)*V(2)/V(1)+V(2)

here V represents the speed of vehicle

so avg. velocity will be 35km/h