When you are travelling by car, plane or train, in the U.S., your speed is measured in miles per hour. At any given point in time, you are travelling at a specific speed, such as 35mph or 65mph, but this does not remain constant throughout your trip. By calculating average mph, you can see how you progressed overall--taking into account the various speed limits and traffic conditions. You may also want to know your average mph to determine your automobile's fuel efficiency.
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Enter the total number of miles travelled into the calculator. Use decimal numbers to represent total mileage if the mileage is not a perfect whole number. For example, 55.5 miles represents 55 plus one-half mile.
Press the "division" key on your calculator.
Enter the total number of hours travelled. Use decimal numbers to represent the hours if the time travelled was not a perfect whole number. For example, use 1.75 hours to represent one hour and 45 minutes. In order to convert minutes travelled into a decimal number, you must divide the minutes by 60, which is the total number of minutes in one hour. For instance, 48 minutes is 0.8 of one hour because 48/60 equals 0.8.
Press the "equal sign" key to calculate the average mph.
For example, to find the average mph for a trip where you travelled 150 miles in two hours and 48 minutes, you must enter "150 / 2.8 =" into the calculator. The completed equation will determine that the average mph for the trip was 53.57mph.
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