Fermat 2023 Part A - Question 8, CEMC UWaterloo

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Difficulty: 5

This problem is tagged with fermat, fermat23, highschool.

(Fermat 2023, Part A, Question 8, CEMC - UWaterloo)

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?
$(A)$ $50$ min
$(B)$ $40$ min
$(C)$ $30$ min
$(D)$ $20$ min
$(E)$ $10$ min

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