Answer:
60 sec=1 minute so 30 sec =1/2 min
so 7 min 30sec = 15/2 mins or 7 &1/2/mins
if you really meant to ask what fraction of an hour is it then you have 7.5/60 = 1/8 of an hour
It is easier to think of it as half of 15 mins which is half of quarter of an hour = 1/8 of an hour.
