3 hours 15 minutes minus 1 hour 35 minutes = 1 hour and 40 minutes
It is: 6 hours and 15 minutes
3 h - (3h 18 min) = minus 18 minutes.
That's 3 hours and 20 minutes
It is minus 2 hours 28 minutes.
It is: 195 minus 24 = 171 minutes or 2 hours and 51 minutes
7 hours 12 minutes - 3 hours 30 minutes = 3 hours 42 minutes
3 hours 45 minutes.
3 hours 15 minutes minus 1 hour 35 minutes = 1 hour and 40 minutes
It is: 6 hours and 15 minutes
2 hours 28 minutes.
3 h - (3h 18 min) = minus 18 minutes.
That's 3 hours and 20 minutes
It is minus 2 hours 28 minutes.
3 hours 40 minutes.
6 hours 24 minutes.
When you subtract (for example) 31 - 15, you have to "borrow" from the ten's place, converting 31 (which is 3 tens and 1 unit) to 2 tens and 11 units. Similarly, when subtracting times, you convert (in this case) the 3 hours to 2 hours and 60 minutes (you convert one of the hours to the equivalent of 60 minutes). Now you can subtract hours minus hours, and minutes minus minutes.