Complete question :
Tony drives his car . He drives the first 13 miles in 13 minutes. He then drives at an average speed of 68mph for 1 hour 24 minutes . Find how much petrol he uses using the information in the table.
Requires table to answer question is attached below
Answer:
2.64 gallons
Step-by-step explanation:
Given that:
First 13 miles takes 13 minutes
Average rate = 13 miles / 13 minutes = 1mile/minute ; Average rate per hour = (1 mile /minute * 60) = 60 miles /hour
If average speed = 65mph or less ; 50 miles per gallon (it uses 1 gallon for 50 miles)
Hence, since first phase rate is 60 mph,; then miles per gallon is 50 miles
Therefore,gallon of petrol used for 13 miles will be :
13 miles / 50 mpg = 0.26 gallons
2nd phase:
Average rate of 68 mph for 1 hour 24 minutes (1.4 hours)
Here, miles per gallon = 40 (that is; 40 miles for 1 gallon).
Total distance covered = 68 * 1.4 = 95.2 miles
Petrol used = 95.2 miles / 40 mpg = 2.38 gallons
Hence,
Total petrol used : (0.26 + 2.38) = 2.64 gallons