Posted by **Sarah** on Friday, February 3, 2012 at 6:12pm.

A 200-miles trip by an electric automobile must be completed in 4 hours. If it takes x number of hours to travel the first half of the distance, write an equation describing the average speed for the second half of the trip as a function of x for the 0<x<4.

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**Anonymous**, Saturday, February 4, 2012 at 12:33am
s = 100/(4-x)

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