# 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?

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 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(60771)   (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? ------------------ t = k*(1/r) --- Find k if t = 5 hr when r = 55 mph 5 = k*(1/55) k = 5*55 = 275 --- Equation: t = 275/r How long would it take at 40 mph? t = 275/40 t = 6 7/8 hrs. ==================== Cheers, Stan H. -----------