SOLUTION: it took sarah's mother 8 hours round trip to drive to the university and bring sara back home for spring break. if the university is 112 miles from home, find her mothers average s

Algebra ->  Equations -> SOLUTION: it took sarah's mother 8 hours round trip to drive to the university and bring sara back home for spring break. if the university is 112 miles from home, find her mothers average s      Log On


   

Question 692915: it took sarah's mother 8 hours round trip to drive to the university and bring sara back home for spring break. if the university is 112 miles from home, find her mothers average speed.
A. 29 mph
B. 28 mph
C. 55 1/2 mph
D. 14 mph
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Each one way trip takes 8/2 = 4 hours.

d = rt

112 = r*4

112/4 = r

28 = r

r = 28

So her average speed is 28 mph.
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