Mach Number:

1. Formula: Mach Number = Aircraft Speed/Speed of Sound (dependent on altitude)
2. Example: Aircraft is flying at 30,000′ Speed of sound at 30,000′ = 589.4 knots. The airspeed is 489.3 knots.
3. Calculate: 489.3/589.5 = 0.83 Mach.

If you go 70 miles in 1 hour, then you’ll go 140 miles in 2 hours, as long as your speed is constantly 70 mph.

1 hour and 40 minutes

Distance = 100 miles if you state that you wanted to complete the journey in 2 hours or you could say that your average Speed is 50 mph. Distance = 100 miles, Time = 4 hours, Therefore the average Speed was 25 mph.

One hour 25 minutes and 43 seconds.

Calculating Speed Suppose you travel a distance of 100 miles, and it takes 1 1/2 hours to do it. Your average speed is then 100 miles divided by 1.5 hours which equals 66.67 miles per hour. When calculating miles per hour for distances that take only minutes, you convert the number of minutes to fractions of an hour.

your distance is 40 miles. time = 40/70 hours. multiply that by 60 to get minutes.

Then, the time needed to travel 50 miles at a 60m/h speed is 50 minutes.

That’s 1 hour 6 mins 23.1264 seconds. 1 hour, 6 minutes and about 20 seconds.

So, when she is driving at 50 mph, it will take her 6/5 hours or 1 1/5 hours or 72 minutes to drive 60 miles.

Thus, it will take 90 minutes to go 60 miles.

minutes

about 17 hours

20 to 30 miles

It depends on the weather, the person’s lung capacity, and one’s body fluid reserves, including electrolytes. Those who already have advanced stage heart failure or have COPD will not be able to, say, walk 10 miles without resting. These people can only walk, say, 30–40 feet until they need to rest.