You can drive a mile at any speed, as long as you have enough time to do so.
It depends on your speed.
Any speed greater than 60 mph will do it.
To average 60 MPH over a 2-mile trip, the total time taken must be 2 minutes. Since the first mile took 2 minutes to drive at 30 MPH, the remaining mile must also take 2 minutes to drive. Therefore, the speed for the second mile needs to be 90 MPH to maintain an average speed of 60 MPH.
At 20 mph how long would it take to drive one mile?
Yes, you can. If the average speed for the first mile is 30 mph, and the average speed for the second mile is 90 mph, then 30+90=120/2=60. You need to solve the equation for average speed, not time. You can't. 1 mile @ 30mph = 2 minutes 60 mph for 2 miles = 2 mintes thererfore you cannot go fast enough (or you could go infinity mph)
At 60 mph your speed is one mile a minute, so the answer has to be 16 minutes.
At 45 mph it takes 1 minute 20 seconds to drive one mile.
It depends on your speed. So, as an example, if you could drive non-stop at a constant speed of 65 mph, it would take about34 minutes.
This cannot be answered properly without knowing what your speed is.
That cannot be answered without knowing your speed over that distance.
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One mile at 60mph would take just one minute.