Oh, dude, let's break out the ol' calculator for this one! So, if you're cruising at a cool 60 miles per hour, it would take you about 7 hours to cover 420 miles. Just enough time to listen to a couple of podcasts and maybe grab a snack... or two.
420 km/(79 km/h) = 5.3165 h = 5 h 19 minutes (approximately)
About 16.8 gallons. 420 miles / 25 miles per gallon = 16.8 gallons
420 Miles.
The average speed is 120 miles per hour.
420/60 = 7 hours
Time = distance/speed Time = 420/70 Time = 6 hours
Average speed = total distance / total time Therefore, total time = total distance / average speed = 420 miles / 60 miles per hour = 7 hours It takes 7 hours to drive 420 miles at 60 miles per hour
420 km per hour is the same as 261 miles per hour.
7 hours to drive 420 miles going 60 mph.
420 miles in 7 hours is 60 MPH (miles per hour).
Time = Distance/Speed = 420/35 = 12 hours
675,920 meters to equal 420 miles.
Assuming the speed is kept constant from beginning to end of the journey: 5 hours and 36 minutes. If you allow for acceleration and deceleration at beginning and end, or during, the journey then a number of additional assumptions need to be introduced. For example, at the beginning, how far and how long does it take to get up to 75 miles per hour? Or, at what rate does the object accelerate and/or decelerate?
It would take approximately 7.6 hours to drive from San Francisco to Los Angeles at a constant rate of 55 miles per hour.
miles per hour * 7 60mph * 7 hours = 420 miles
420 km/(79 km/h) = 5.3165 h = 5 h 19 minutes (approximately)
By mph, I assume you mean miles per hour, and not meters per hour. We do know, 1 km = 0.6213 mile Therefore, 420 km/h x (0.6213 mile/1km) = 260.9 miles per hour = 261 miles per hour (rounded off to 3s.f.)