Verified answer

Bonjour

Calculer :

a. 2 min 15 s + 1 h 03 min

= 1 h (2 + 3) min 15 s

= 1 h 5 min 15 s

b.3 min 54 s + 10 s

= 3 min (54 + 10) s

= 3 min 64 s

= (3 + 1) min (64 - 60) s

= 4 min 4 s

c. 5 min 37 s - 38 s

= 5 min (37 - 38) s

= (5 - 1) min (37 + 60 - 38) s

= 4 min (97 - 38) s

= 4 min 59 s