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Omni-MATH / A bicycle trip is 30 km long. Ari rides at an average speed of 20 km/h. Bri…

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problem

A bicycle trip is 30 km long. Ari rides at an average speed of 20 km/h. Bri rides at an average speed of 15 km/h. If Ari and Bri begin at the same time, how many minutes after Ari finishes the trip will Bri finish?

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