You work for a swimming pool company and need to drain a pool to service it. The pipe drains at a rate of 45 liters per minute. If there are 1,000 liters in 1 kiloliter and 60 minutes in 1 hour, how fast will the pool drain in kiloliters per hour?

Convert 45 liters per minute to liters per hour: 45 × 60 = 2,700 liters per hour. Since 1 kiloliter is 1,000 liters, divide 2,700 by 1,000 to get 2.7 kiloliters per hour. The correct choice is C, 2.7 kiloliters per hour.

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