Question

A woman drove from point A to B at 20 km per hour. She returned along the exact same route at 30 km/h. What was her average speed for the over all trip?

Answer 1

Answer:

24km/h

Step-by-step explanation:

Let distance of A and B be x.

Time  to go from A to B at 20 km/h=x/20

Time to go from B to A at 30 km/h=x/30

Total time = x/20+2/30=5x/60

Total distance = AB+BA=x+x=2x

Average speed= Total Distance/ Total time= 2x/5x/60

=60*2/5=120/5=24