Question

The average speed of a person in driving to school is 30km/h. On the return trip along the same route the average speed is 25 km/ h. What is the average speed for the whole journey.

Answer 1

Answer:

by applying formula 2*v1*v2/v1+v2

2*30*25/30+25

1500/55

=27.273

Answer 2

Explanation:

let distance =x

total distance=2x

time= d/s

t1= x/30

t2=x/25

total time=x/30+x/25

=5x+6x/150=11x/150

average speed= total distance/ total time

=2x/11x(150)

=27.27

Hope this helps