Videos Test Yourself Books MathFacts Math Diagnostics Math Tricks Daily PhysEd
Class Photos Worksheets Insectclopedia Musiclopedia Techlopedia Teacher Timesavers Study Guides


Peggy goes up a ski lift at 10 km/h.
She comes down the slope at 50 km/h.
The slope and the lift are the same length.
She does not waste time at the top.

Question: What is the average speed for the round trip?

See answer

Brain Teasers