We use conversion graphs to change from one unit to the other. Conversion graphs always are straight lines.
A rule written out in algebra is a formula.
you don't write:
t= 3 x m
it is correct for a formula to be written like this:
am stands for ante meridian (before noon)
pm stands for post meridian (after noon)
Timetables buses and trains usually use the 24 hour clock.
Midnight is 00:00
You can enter times in your calculator by using the DMS or ° ' " keys.
Time is shown along the horizontal axis. Distance is always shown on the vertical axis.