SOLUTION: I rode my bike for 15 minutes. For 10 minutes I rode for 15 mph, for 5 minutes I rode for 20 mph. what is my average speed for the entire trip.

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Question 668969: I rode my bike for 15 minutes. For 10 minutes I rode for 15 mph, for 5 minutes I rode for 20 mph. what is my average speed for the entire trip.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
I rode my bike for 15 minutes.
For 10 minutes I rode for 15 mph, for 5 minutes I rode for 20 mph.
what is my average speed for the entire trip.
:
Convert 15 min to 1%2F4 or .25 hr
:
Convert 10 min to 1%2F6 hr
Find the distance at 15 mph; 1%2F6*15 = 2.5 mi
:
Convert 5 min to 1%2F12 hr
Find the distance at 20 mph; 1%2F12*20 = 1.67 mi
:
then total distance:
2.5 + 1.67 = 4.17 mi
:
Average for the trip (total dist/total time): 4.17/.25 ~ 16.8 mph