SOLUTION: A train traveled at a rate of 90 miles per hour for x hours, and then at a rate of 60 miles per hour for y hours. What expression represents the train's average rate in miles per h
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Question 713841: A train traveled at a rate of 90 miles per hour for x hours, and then at a rate of 60 miles per hour for y hours. What expression represents the train's average rate in miles per hour for the entire distance traveled? Answer by mananth(16946) (Show Source):
You can put this solution on YOUR website! distance I 90*x
distance II = 60*y
Total time taken = x+y
Total distance = 90x+60y
speed = distance/time
speed = (90x+60y)/(x+y) mph
