The Time It Takes to Go a Given Distance Depends

question 83

Essay

The time it takes to go a given distance depends on the rate.
(a)Write a function t(r)for the time it takes if the distance is 400 miles and the rate is r miles per hour.
(b)How much time is needed when the rate is x?
(c)If the speed is increased by 10 miles per hour,how much less time is needed?
(d)How much less time is needed per mile per hour increase?
(e)If the speed is increased by h,how much less time is needed?
(f)How much less time is needed per unit increase?

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