Speed time distance maths...
Okay I know the SDT triangle but what I am after is any easier way of doing the maths very quickly mentally. This seems like the best place to ask what with all the Nav's and pilots etc.
How does one quickly work out Time if you have travelled 50 miles at 90mph?
Are there any easy ways bar learning all the distances travelled at each MPH or that at 60mph you are doing 1 mile per minute etc?
Forgive my lack of mathmatical ability, its just so easy with a calculator , its just OASC doesn't allow them!!