Asked by Sandra

The time, t, required to drive a certain distance varies inversely with the speed, r. If it takes 7 hours to drive the distance at 55 miles per hour, how long will it take to drive the same distance at 65 miles per hour?
• about 6.25 hours
• about 385.00 hours
• about 5.92 hours
• about 3.21 hours
Show how to get answer...
Answered by Steve
since ts = k is constant,
and 65 = 13/11 * 55,

(7)(55) = (11/13 * 7)(13/11 * 55)
11/13 * 7 = 5.92
Answered by Sandra
It always help to see how it is done. Thanks.
Answered by Steve
you can also see that since st is constant,

65t = 55*7
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