if you go 60 miles an hour steady ...you go 60 miles if you go 50 miles an hour you go 50 miles ...do the math
about 2.5 hours
it would take 1.93333333 hours
six hours 870 / 145 = 6
less than two minutes.
6 Hours
Miles are a measurement of distance. Hours are a measurement of time. These two have no connection, unless you are trying to ask how long it would take you to travel 145 miles. In this case, it would depend on your travelling speed.
It will take six hours.
Distance = Rate * Time or, for our purposes Time = Distance/Rate Time = 870 miles/145 miles per hour = 6 hours --------------
To travel 145 miles in 3.5 hours requires an average speed of 145/3.5 mph. The distance traveled at this speed for 5 hours would be approximately 207 miles (5 x 145/3.5 miles).
3 hours 37.5 miles.
145/2=72.5 MPH
time = distance / speed = 145 miles / 70 miles/hour ~= 2.07 hours ~= 2 hours 4 mins
about 2 1/2 hours