SOLUTION: A car travels up a hill at a constant speed of 35 km/h and returns down the hill at a constant speed of 67 km/h. Calculate the average speed (in km/h) for the round trip.

Question 311659: A car travels up a hill at a constant speed of 35 km/h and returns down the hill at a constant speed of 67 km/h. Calculate the average speed (in km/h) for the round trip.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A car travels up a hill at a constant speed of 35 km/h and returns down the hill at a constant speed of 67 km/h. Calculate the average speed (in km/h) for the round trip.
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UP DATA:
rate = 35 km/h ; time = x hrs ; distance = 35x km
----------------
Down DATA:
rate = 67 km/h ; time = y hrs ; distance = 67y km
------------------------------
Average speed = (total distance)/(total time)
---
Ave speed = (35x+67y)/(x+y) km/h
====================================
cheers,
Stan H.
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