SOLUTION: A bicyclist rode from point A to Point B at an average speed of 30 km/hr. Without stopping, he returned from Point B to Point A, following the same route, at an average speed of 20
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Question 634512: A bicyclist rode from point A to Point B at an average speed of 30 km/hr. Without stopping, he returned from Point B to Point A, following the same route, at an average speed of 20 km/hr. What was the average speed in km/hr over the course of the ride?
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
A bicyclist rode from point A to Point B at an average speed of 30 km/hr.
Without stopping, he returned from Point B to Point A, following the same
route, at an average speed of 20 km/hr.
What was the average speed in km/hr over the course of the ride?
:
Let a = the average speed for the round trip
Let d = one-way distance
:
Write a time equation, time = dist/speed
:
A-B time + B-A time = Total time
+ =
We don't need d, divide thru by d
+ =
multiply by 60a, resulting in
2a + 3a = 2(60)
5a = 120
a = 120/5
a = 24 km/h is the average speed for the round trip
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