The basic formula here is the definition of speed:
speed = distance / time
Or:
distance = speed x time
Replace the data you know, and solve for the one you don't know.
It would take 12 minutes to drive 20 miles at 100 mph.
an hour?
Depends on speed.
100 miles at 100 mph would take 1 hour
1hr 25mins
Exactly 1 hour
100 miles
48 minutes.
depends on how fast can you drive.:)
2.73 seconds.
At an average 100 kph, it will take 7 hours.
Assuming you could drive at 100 km/h the whole time, it would take 3.0 hours