OUTBOARD GAS CONSUMPTION

 For years, we computed outboard gas consumption easily. While there were a few differences, most outboards burned gas according to the following formula: Gas consumption per hour= horsepower/10 A 40 hp motor would burn 4 gallons per hour. A 20 ph would burn ______ gallons per hour. A 9.9 hp would burn _______ gallons per hour. A 90 hp would burn _______ gallons per hour.
But nowadays, there is great difference among motors. Some brands of 2 cycle engines burn fuel by the formula:
Gas consumption per hour= horsepower/12

Four cycle engines are now boasting of even better gas consumption. Many burn gas according to the formula:

Gas consumption per hour= horsepower/15.

Using the above formula of:

Gas consumption per hour= horsepower/15,

how much gasoline would an engine burn with the following horse-power and given time of operation?

a 40 ph for 4 hours?
A 25 hp for 3 hours?
A 90 hp for 6 hours?
A 6 hp for 9 hours?

Write the formula for your family's outboard motor gas consumption.
In each case we assume that the engine is being run full throttle.