SOLUTION: a motorist travelled 320 km in five hours.Her average speed for the first 160 km was 80 km per hour.What was her average speed for the second 160 km

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Question 718231:
a motorist travelled 320 km in five hours.Her average speed for the first 160 km was 80 km per hour.What was her average speed for the second 160 km
Answer by checkley79(3341) About Me  (Show Source):
You can put this solution on YOUR website!
D=RT
160=80T
T=160/80
T=2 HOURS FOR THE FIRST LEG.
5-2=3 HOURS FOR THE SECOND LEG.
160=R*3
R=160/3
R=53.33 MPH IS THE RATE FOR THE SECOND LEG.