(154 miles)/(50 miles/hour) = 3 and 2/25, or 3.08, hours. (If the number "50" is not considered exact, the decimal answer should be written with only two significant digits as 3.1 hours.)
At what speed?
Depends on your speed.
That depends on the speed.
It depends on the speed of travel.
That depends on your speed.
That depends on the speed. Divide the distance by the speed.
The number of hours it will take to travel 308 miles is(308)/(your average speed, in miles per hour)
It would depend on your speed
It depends on your speed
That depends on your speed.
That depends on your speed.
That depends on your speed.