likely useful to add minutesToSeconds and secondsToMinutes conversions

[kayvonf]

I see a number of "* 60" and "/ 60" 's in the code. To avoid potential typos/errors and to improve clarity let's make some helper routines.

def minutesToSeconds(x) def secondsToMinutes(x)

Alternatively, we could use datetime.timedelta.

[jhong93]

This is added in now along with a change to use timedeltas.