Question 268456
55 mph means you can travel 55 miles in 1 hour. So using unitary method, you can travel 1 mile in 1/55 hours.
This means you can travel 5 miles in 5 x {{{1/55}}} ={{{1/11}}} hrs and 10 miles in {{{10/55}}} or {{{2/11}}} hours.

Otherwise the formula for time is Distance/Speed (provided the unit of distance is same as the unit distance used to specify the speed).
So for 5 miles the time ={{{5/55}}} hrs.