SOLUTION: If your job is 15 miles away, how fast would you have to drive to get there 5 minutes sooner than if you drive at 65 mph?

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Question 842665: If your job is 15 miles away, how fast would you have to drive to get there 5 minutes sooner than if you drive at 65 mph?
Found 2 solutions by ewatrrr, josgarithmetic:
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

time in minutes at 65mph is 15%2F65mph = .23h = 13.85 min 

 15m/8.85min = 1.7mpmin 0r 102mph

Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
What is the normal time, if 65 mph?
RT=D
T=D/R
T=15/65 hours

Five Minutes Less Time:
What speed?
R=D/t and you want t=15%2F65-1%2F12, because five minutes is 1/12 hour
-
R=15%2F%28%2815%2F65-1%2F12%29%29 mph
Using decimalized numbers, R=15%2F0.147436=highlight%28102%29 mph