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Gallons of fuel remaining for 45 minutes at a burn rate of 17.8 gallons per hour?

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The main idea is to use proportional time with a burn rate: convert the time to hours and multiply by the hourly burn rate to get gallons used.

Convert 45 minutes to hours: 45/60 = 0.75 hours. Multiply by the burn rate: 17.8 gallons/hour × 0.75 hours = 13.35 gallons.

Since fuel amounts are given in whole gallons in the options, the value that best matches is 13 gallons (13.35 rounds to 13). The other options correspond to shorter nozzles of time at that rate, so they don’t fit 45 minutes.

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