If you are traveling at a constant rate of 300 mph, this is a pretty straight-forward problem.
We know that speed (or V, for velocity) is equal to Distance divided by Time, so we have:
V = D/T
In this case we are looking for T, so we solve the equation for T and we get:
T = D/V
Since we know both D and V we can plug them in to get 100/300 or 1/3 of an hour which is 20 minutes.
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100/300 = 1/3 hour = 20 minutes
time = distance / speed so, 450 miles / 100 mph = 4.5 hours
A train
18 miles divided by 51 mph = 0.352941176 hours = 21 minutes 10.59 seconds. (rounded to the 100-th of a second).
Depends on speed.