SOLUTION: The time t required to drive a fixed distance varies inversely as the speed r. It takes 5 hr at 55mph to drive a fixed distance. How long would it take at 40 mph?

Question 242752: The time t required to drive a fixed distance varies inversely as the speed r. It takes 5 hr at 55mph to drive a fixed distance. How long would it take at 40 mph?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
The time t required to drive a fixed distance varies inversely as the speed r. It takes 5 hr at 55mph to drive a fixed distance. How long would it take at 40 mph?
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t = k*(1/r)
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Find k if t = 5 hr when r = 55 mph
5 = k*(1/55)
k = 5*55 = 275
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Equation:
t = 275/r
How long would it take at 40 mph?
t = 275/40
t = 6 7/8 hrs.
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Cheers,
Stan H.
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