Question

A girl ran to a store at the rate of 6 miles per hour, and she walked back at the rate of 4 miles per hour. If it took 15 minutes for the round trip, how far away is the store?

Answer 1

Answer:

distance=rate*time

d=6t

d=4(0.25-t) (15 minutes=0.25 hours)

6t=4(0.25-t)

6t=1-4t

6t+4t=1

10t=1

t=1/10 of an hour

d=6t

d=6(1/10)

d=6/10 or 3/5 of a mile

the store is 6/10 or 3/5 of a mile away