Question

Motor cyclist price from a to be with the uniform speed of 50 km/h and returns back with a speed of 20 km/h find its average speed

Answer 1

here is your answer....

let distance x
average speed = total distance/total time
Vav= 2x/÷x/20+x/50
=2x÷x{1/20+1/50}
=2÷5+2/100
=2×100/7
=200/7
=28.57 km/h