Subtraction of Time

Mathematics

Not quite remember

I easily remember

42 seconds – 39 seconds =

3 seconds

75 seconds – 10 seconds – 17 seconds =

48 seconds

300 minutes – 180 minutes =

120 minutes

91 minutes – 34 minutes =

57 minutes

86 hours – 25 hours =

61 hours

15 minutes – 10 seconds – 12 minutes 30 seconds =

2 minutes 20 seconds

6 hours 40 minutes – 1 hour 15 minutes =

5 hours 25 minutes

4 hours 20 minutes − 15 minutes − 1 hour 50 minutes =

2 hours 15 minutes

58 minutes 16 seconds − 17 minutes 12 seconds − 30 seconds =

40 minutes 34 seconds

45 minutes - 35 minutes =

10 minutes

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