How to use

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Accuracy  number of significant decimal digits:
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Calculation Examples
Speed Calculation  suppose we want to calculate Usain Bolt average speed during his world record winning 100 m sprint race in Berlin August 16, 2009 (this is default calculation displayed when you enter the page). What do we know?
Calculator answers in input box labeled 'speed'. Note, that you can choose desired unit of speed and, for example, if you set units to yards per second, you get the answer: Bolt ran 11.42 yards per second during the race. Setting meters per second, you get 10.44 mps; miles per hour  23.35 mph; kilometers per hour  37.58 kmh; etc. Travel Time Calculation  Suppose, you drove 21 miles with average speed 45 miles per hour. How long did you drive? To solve this problem, simply:
Distance Calculation  Let's calculate, how many miles you can travel, driving 2 hours and 30 minutes with the average speed 55 miles per hour? To answer the question, you should:
Time/Distance/Speed Calculation Formulas
Assume, V  stands for average speed (velocity), T  stands for traveling time and D  stands for traveled distance. Average Speed can be calculated by using the formula: V = D/T Traveled distance can be calculated as: D = V*T Traveling time can be calculated using: T = D/V Using the formulas remember about the units. For example, if the distance is given in meters and the time is given in seconds, calculated average speed is given in meters per second. To convert it to other units of measurement, you can use our speed converter. If the distance is given in yards and speed is given in miles per hour, to get time in hours, you HAVE TO convert yards to miles or miles per hour to yards per hour first. CloseHelp
The calculator uses HH:MM:SS.MS time format, where:
HH stands for hours, MM for minutes, SS for seconds and MS stands for milliseconds.
72.5:11 72 and half hour + 11 minutes = 72 hours and 41 minutes :11:7 11 minutes and 7 seconds :90 90 minutes (one hour and 30 minutes) ::90 90 seconds (one minute and 30 seconds) ::28 28 seconds 
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