SOLUTION: Starting at 1 PM, Claude drove the first 27km of his bus route at 15 km/h. How fast must he drive the last 30 km of the route (on the average) in order to arrive at his final stop

Question 888597: Starting at 1 PM, Claude drove the first 27km of his bus route at 15 km/h. How fast must he drive the last 30 km of the route (on the average) in order to arrive at his final stop by 4 PM?
I was thinking - 15 + x = 57 , but that makes no sense. The answer is at least 25km/h. And that's not even close to what I got.. :/ Thanks!
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
His time for the first km was:

hrs
From 1 PM to 4 PM is hrs
He has hrs to get to his final stop
-----------------
Let = the speed he needs for last km

km/hr

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