SOLUTION: The problem reads to solve: 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 ta

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Question 128621This question is from textbook Introductory Algebra
: The problem reads to solve: 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 40mph?
Any help with this problem would be greatly appreciated.
This question is from textbook Introductory Algebra

Answer by Earlsdon(6294)   (Show Source): You can put this solution on YOUR website!
Try this:
Now you need to find the value of k, the constant of variation. Substitute the given values of r = 55mph and t = 5hr.
Multiply both sides by 55.
Now rewrite the variation as:
Substitute r = 40mph

hours or t = 6 hours and 52.5 minutes.

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