ExplanationTo find Kurt’s wait time, determine how long it will take for 200 people to board the Jelly Coaster. The problem states that 4 people board every 15 seconds. Since there are four 15-second periods in one minute, this rate converts to 16 people per minute. To find the time, divide the “work” (the people) by this rate:

200 people ÷ 16 people per minute = 200 ÷ 16 = 12.5 minutes.

The question asks for an approximation, and the closest answer is (D). In theory there may be an additional 15 seconds while Kurt’s group is boarding (the problem doesn’t really say), but Kurt’s total wait time would still be approximately 13 minutes.

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Sandy

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