Question

A lady traveled 100 kilometers at a rate of 30 kilometers an hour. If she wants her return trip to be three-fourths of her initial trip, at what rate must she return?

Answer 1

Explanation:

100/30=3 1/3hrs to go

3 1/3*3/4=

10/3*3/4=30

30/12=2 1/5hrs return

100/2 1/2=

100/(5/2)=

100*2/5=200/5=40

100/2.5=40mph return