Pre-calc

a driver averaged 50 miles per hour on the round trip between akron, oh and Columbus, oh, 100 miles away. The average speeds for going and returning were x and y miles per hour, respectively.

a. show that y=25x/x-25


b. determine the vertical and horizontal asymptotes of the function.

c.using a graphing utility to graph the function

d. complete the table
x | 30 | 35 | 40 | 45 | 50 | 55 | 60|
y | | | | | | | |

e. are the results in the table unexpected? explain.

f. is it possible to average 20 miles per hour in one direction and still average 50 miles per hour on the round trip? explain.

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asked by Andy G
  1. f)

    time for whole trip = 200/50 = 4 hrs

    time to go one way at 20 mph
    = 100/20 = 5 hrs.
    oops, whole trip only took 4 hrs. so ......

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    posted by Reiny

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