# Leaky Car

A car travels at a steady speed of 45 mph. Its fuel consumption is 30 miles to the gallon. It has a 15-gallon gas tank, which was full when the car started off. But at the very moment the car begins to move at 45 mph, the gas tank begins to leak fuel.

After 225 miles, the car stops because it’s got an empty gas tank. How many gallons per hour was the car leaking fuel?

### 2 guesses to Leaky Car

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• Golly Kim

Car consumed 225/30 gallons of fuel = 7.5 gallons
Car was filled with 15 gallons and hence, the amount of fuel leaked was 15 – 7.5 = 7.5 gallons
Car ran till 225 miles at 45 mph; that is, it ran for 225/45 = 5 hrs

So, the fuel leak per hour is 7.5/5 = 1.5 gallons per hour

• Dude

You’re correct, Golly Kim!

225 miles of driving at 45 miles an hour equals five hours of driving. The Fiat got 30 miles to the gallon, so those 225 miles used up seven and a half gallons of gasoline. And seven and a half gallons must have leaked out, because it didn’t go any farther than those 225 miles. And in five hours, it lost seven and a half gallons of gasoline, which is a gallon and a half an hour.

You are today’s winner.