Adam rides his bike to work in the morning at 30 km/hr, as he figures the earlier he gets to work, the earlier he gets to leave. When he leaves work, he’s so happy that he takes the scenic route home (twice the length of his ride to work) and travels at only 25 km per hour. What is his average speed for the round trip?

25 0

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a.345/13, b.450/17,

c.53/2, d.132/5