Posted by berha on Saturday, September 19, 2009 at 11:24am.
Is the question average speed?
Assuming average speed, you must find total distance, then total time, then divide them
Time is easy: 24 + 36 + 44 + 13 minutes
So how far do you get driving 24.0 min at 63.0 km/h? 36.0 min at 45.0 km/h? 44.0 min at 49.0 km/h?
60 min at 63 kph would bring you 63 km, so 24 min at 63 kph will bring you (24 / 60) * 63 km = 25.2 km
Then do the same for the other distances, and divide your total distance by total time
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