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Round Trip Train Ride: What is the Average Speed?

GMAT-DNK3KA

A train goes from Oak Grove to Watsonville at $30$ mph, then returns at a speed of $50$ mph.

What is the average speed for the entire trip?

A

$30$ mph

B

$35$ mph

C

$37.5$ mph

D

$40$ mph

E

$42.5$ mph