Subtraction and Addition of Time

7 hours + 6 hours − 4 hours =

9 hours

40 minutes − 9 minutes + 28 minutes =

59 minutes

27 seconds + 43 seconds – 21 seconds =

49 seconds

5 hours + 2 hours 5 minutes − 1 hour 30 minutes =

5 hours 35 minutes

36 minutes 50 seconds – 17 minutes 40 seconds + 20 minutes 13 seconds =

39 minutes 23 seconds

1 1 hours + 5 hours − 10 hours =

6 hours

42 minutes + 19 minutes − 16 minutes =

45 minutes

50 seconds − 23 seconds + 28 seconds =

55 seconds

5 hours 45 minutes + 3 hours 12 minutes − 1 hour 39 minutes =

4 hours 18 minutes

7 minutes 8 seconds – 1 minute 23 seconds + 6 minutes 5 seconds =

11 minutes 50 seconds