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The Mach number for the speed of an object travelling through a particular medium is the ratio of the object's speed relative to the speed of sound through the same medium. The speed of sound through any medium depends on the nature and density of the medium and, as a result, so does the Mach number. In air, the Mach ratio is mostly dependent on temperature and humidity, less so on altitude.
Generally, Mach 1 (in air, at standard sea level conditions, and at 15 deg C) is approx 760 mph. So Mach 3 would be approx 2280 mph. But Mach 3 in water, for example, would be much faster since sound travels faster in water.
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How long to walk 3 miles at 3 miles per hour?
one hour.
How many miles per hour is 3 minutes per miles?
60 miles per hour is the same as one mile per minute. That means that one mile per 3 minutes is the same as one-third of 60 miles per hour. The answer is thus 20 miles per hour.
What is the rate in miles per hour of a plane that travels 1680 miles in 3 hours?
1,680/3 = 560 miles per hour
How fast is 3 miles per hour?
In an hour you can move 3 miles. Not so fast.
3 kilometers per hour equals how many miles per second?
3 km per hour = 1.86 miles per hour = 1.86/60 = 0.031 miles per minute = 0.031/60 = 5.2*10-4 miles per second.
