Question

Tony drives his car.

He drives the first 13 miles in 13 minutes.
He then drive at an average speed of 68 mph for 1 hour 24 minutes.
Use the information given on the table to find out how much petrol he uses.

Average speed Miles traveled per gallon
65 mph or less 50
More than 65 mph 40

Answer 1

2.64 gallons

Explanation:

Answer 2

The total amounts of petrol used up by his car is 3.235 gallons.

Explanation:

Tony drives his car and drives the first 13 miles in 13 minutes.

So, the average speed was
`(13)/(13) * 60 = 60` mph.

which is less than 65 miles per hour, and the miles traveled per gallon is 50.

So, 50 miles of travel is done by 1 gallon of petrol.

Hence, 13 miles travel is done by
`(13)/(50) = 0.26` gallons of petrol.

Now, Tony then drives at an average speed of 68 mph > 65 mph for 1 hour and 24 minutes i.e. 1.75 hours.

Then he travels (68 × 1.75) = 119 miles and the miles traveled per gallon is 40.

So, 40 miles of travel is done by 1 gallon of petrol.

Hence, 119 miles travel is done by
`(119)/(40) = 2.975` gallons of petrol.

Therefore, the total amount of petrol used up by his car is (0.26 + 2.975) = 3.235 gallons. (Answer)