SOLUTION: Brad ran at 3.5 mph for 0.2 hours and then began bicycling at 15 mph. If he went a total of 8.2 miles, how long did he bike?

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Question 269847: Brad ran at 3.5 mph for 0.2 hours and then began bicycling at 15 mph. If he went a total of 8.2 miles, how long did he bike?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
D=RT
D=3.5*.2
D=.7 miles running.
8.2-.7=15(T-.2)
7.5=15T-3
15T=7.5+3
15T=10.5
T=10.5/15
T=.7 HOURS BIKING.
Proof:
8.2-.2*3.5=15(.7-.2)
8.2-.7=15*.5
7.5=7.5