Posted by **sal** on Wednesday, October 19, 2011 at 11:38pm.

A car leaves an intersection traveling east. Its position t sec later is given by

x = t2 + t

ft. At the same time, another car leaves the same intersection heading north, traveling

y = t2 + 3t ft

in t sec. Find the rate at which the distance between the two cars will be changing 3 sec later. (Round your answer to one decimal place.)

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