story problem in the description

Question

You want to meet your friend at a park 4 mi away from your house.  You are going to bike to the park at an average rate of 10 mi/hr.  Your friend lives 1.2 miles away from the park and walks at an average rate of 3 mi/hr.  How many minutes ahead of you should your friend start out so that you meet at the park at the came time?

Answer 1

d=rt

4=10t

t=4/10

t=2/5 hr

t=24 minutes

 

d=rT

1.2=3T

T=1.2/3

T=12/30

T=2/5 hr

T=24 minutes

you both should start out at exactly the same time