SOLUTION: The distance between two cities is 96 km. If the train travelled 12 km more in an hour, it would take 40 minutes less to cover the distance. What is the trains actual speed?

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Question 1139935: The distance between two cities is 96 km. If the train travelled 12 km more in an hour, it would take 40 minutes less to cover the distance. What is the trains actual speed?
Answer by josgarithmetic(39621) About Me  (Show Source):
You can put this solution on YOUR website!

actual                r         96%2Fr             96

if                  r+12        96%2F%28r%2B12%29             96

difference                     2%2F3

96%2Fr-96%2F%28r%2B12%29=2%2F3
Simplify and solve for r.