SOLUTION: Xavier drove from his house to the country in 3 hours. Driving at a speed of 12 mph less than on the trip out, he spent 4 hours on the return trip. What was his average rate on t

Question 1002843: Xavier drove from his house to the country in 3 hours. Driving at a speed of 12 mph less than on the trip out, he spent 4 hours on the return trip. What was his average rate on the return trip?

Answer by josgarithmetic(39626) (Show Source): You can put this solution on YOUR website!

             rate       time     distance
GOING          r         3        d
RETURN        r-12       4        d

The question asks for the rate for the RETURN trip. The variables can be
reassigned this way:

             rate       time     distance
GOING         r+12       3        d
RETURN        r          4        d

The new assigning for the rates still keeps the return rate as 12 mph less than the going-to rate.

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