# SOLUTION: Jane took three hours to drive to her friend's home on the weekend. Her average speed was 85km/hr for the first two hours. What was her average speed for the last hour of the trip

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 Question 384807: Jane took three hours to drive to her friend's home on the weekend. Her average speed was 85km/hr for the first two hours. What was her average speed for the last hour of the trip if her average speed was 75km/hr for the whole trip?Answer by ptaylor(2048)   (Show Source): You can put this solution on YOUR website!Distance(d) equals Rate(r) times Time(t) or d=rt; r=d/t and t=d/r also Average Speed =(Total Distance)/(Total Time) Total Distance in this problem is distance traveled for first 2 hours plus distance traveled in last hour Total Time =3 hours For the first two hours, distance traveled was 85*2=170 mi Let d=distance traveled in the last hour Soooo, our equation to solve is: 75=(170+d)/3 225=170+d d=55 miles----distance traveled in last hour Average Speed for last hour was 55/1=55 mph CK 75=225/3 75=75 Hope this helps---ptaylor