Question: A mining cart is pulled up a hill at 20 km/h and then pulled back down the hill at 35 km/h through its original level.

A mining cart is pulled up a hill at 20 km/h and then pulled back down the hill at 35 km/h through its original level. (The time required for the cart's reversal at the top of its climb is negligible.) What is the average speed of the cart for its round trip, from its original level back to its original level?

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