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25 November, 12:02

The time t required to drive a certain distance varies inversely with the speed r. If it takes 4 hours to drive the distance at 35 miles per hour, how long will it take to drive the same distance at 45 miles per hour?

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  1. 25 November, 12:09
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    The formula for this is t = k/r, read "t varies inversely as r". If the info they give us is 4 hours and 35 miles per hour, we find that k = 140. Now use that 140 in another equation to solve for t: t = 140/45, and t = 3.1 hours
  2. 25 November, 15:27
    0
    T = k/r/

    4 hours and 35 miles per hour,

    we find that k = 140.

    Now use that 140 in another equation to solve for t:

    t = 140/45, and

    t = 3.1 hours
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