SOLUTION: The rate (R) of a car varies inversely with the time (T). A trip takes 8 hours at 60 km/hr. How long will be the same trip take at 70 km/hr?

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Question 1173945: The rate (R) of a car varies inversely with the time (T). A trip takes 8 hours at 60 km/hr. How long will be the same trip take at 70 km/hr?
Answer by Cromlix(4381) About Me  (Show Source):
You can put this solution on YOUR website!
Hi,
R varies inversely with Time
R = k/T
60 = k/8
k = 480
R = 480/T
70 = 480/T
T70 = 480
T = 480/70
T = 6.86 (2 dp)hrs.
Hope this helps :-)