25m+20m+35m+50m = 130m
knowing there is 60 minutes in an hour...
130m/60m = 2,... Its 2 hours and something,leave de decimals.
so 2 hours is 2*60m=120m
substract the initial time by the 120m that is our complete 2 hours.
130m-120m=10m
so add hours to min we have: 2h10
You're welcome 