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Christine drives her car 144 miles and has an average of a certain speed. If the average speed has been 5 mph more, she could have traveled 168 miles in the same length of time. What was her average speed?

User Dival
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1 Answer

9 votes

Let's make a system of equations:

144/x=y

168/(x+5)=y

So,

144/x=168/(x+5)

Solving using cross multiplication,

x=30


So, her average speed for driving 144 miles was 30 miles per hour.

-Hunter

User Yaxu
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