SOLUTION: I don't know how to figure this out. "My little brother left 2 minutes ago on his bike to ride with his friends to the cemetery. If he pedals at 5 mph to the cemetery, which is 1

Question 522890: I don't know how to figure this out. "My little brother left 2 minutes ago on his bike to ride with his friends to the cemetery. If he pedals at 5 mph to the cemetery, which is 1 mile from here, and I go the back way (2.5 miles) so he doesn't see the car, how fast do I have to drive Mom's car to get there at least a full minute ahead of him so I can hide and scare him?
I know the brother needs 12 minutes to go a mile, and he left 2 minutes ago, so he has 10 minutes to go.
I know the car driver needs to be there in 9 minutes. That makes 3.6 minutes a mile. What do I do from here?
Thank you!
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
My little brother left 2 minutes ago on his bike to ride with his friends to the cemetery. If he pedals at 5 mph to the cemetery, which is 1 mile from here, and I go the back way (2.5 miles) so he doesn't see the car, how fast do I have to drive Mom's car to get there at least a full minute ahead of him so I can hide and scare him?
------------------
Brother DATA:
rate = 5 mph ; distance = 1 miles ; time = d/r = 1/5 = 12 minutes
--------------------------
You DATA:
distance = 2.5 miles ; time = 11 minutes ; rate = d/t = 2.5/11 miles/min
---
11 min = 11/60 hr = 0.1833 hr
----
2.5/11 (miles/min) = 2.5/0.1833 = 13.64 miles/hr
=================================
Cheers,
Stan H.
================
RELATED QUESTIONS
Gene spent 10 minutes riding his bicycle to a friends house. He left his bike there and... (answered by stanbon)

I am desperately trying to help my niece with homework while her parents are out of town. (answered by ankor@dixie-net.com)

find the sum of the first 112 odd positive intergers. I need the correct formula to use... (answered by venugopalramana)

Word problem: David gets to work in 20 minutes when he drives his car. Riding his bike... (answered by josgarithmetic,ikleyn)

Al can wash the family car in 60 minutes while it takes his little brother Bill 80... (answered by ewatrrr)

I have no idea how to go about this problem, could you please help me with the set up and (answered by ankor@dixie-net.com)

it takes mr zotter 25 minutes to ride his bike 5 miles at this rate how long will it take (answered by ReadingBoosters)

Charlie wants to order lunch for his friends. He'll order 6 sandwiches and a $3 kid's... (answered by addingup)

Fifteen minutes after a boy left for school on his bike, his mother noticed that he left... (answered by ankor@dixie-net.com)