Question

Bob's car gets 20 miles per gallon of gas. if bob's car is traveling at a constant rate of 60 miles per hour, how many gallons of gas will his car use in 30 minutes? enter your answer as an exact value.

Answer 1

3/2 gal = 1.5 gal

Explanation:

The amount of gas used in a given time is found by multiplying the rate of gas usage by the time.

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rate of gas usage

(60 mi/h) / (20 mi/gal) = 3 gal/h

usage in 30 min

We know that 30 minutes is 1/2 hour, so the usage in 1/2 hour is ...

(1/2 h) × (3 gal/h) = 3/2 gal = 1.5 gal