Average speed: total distance over total time
The Round Trip
A cyclist rides to the beach at 20 mph and back at 30 mph. A four-minute film on why her average speed is not 25, how the slow leg counts for more, and why the length of the road never matters.
This browser has 3D graphics turned off, so the set cannot be drawn. The math and the narration still play.
The problem
A cyclist rides from her house to the beach at 20 miles per hour and rides back along the same road at 30 miles per hour. What is her average speed for the whole round trip?
24 mph
