Bonjour,
4 h 18 min =60*4 + 18 = ... min
5 h 26 min =5*60 + 26= ...min
18 min 20s = 18*60- 20= .........s
10 h 13 min =10*60 +13 ...... min
je te laisse faire les additions
10 H 45 MIN
+8 H1 4 MIN
10+8 = 18
45+4 = 49
=> 18h 49mn
8 H 10 MIN
+ 7H 42 MIN
8+7 = 15
10+42 = 52
=> 15h52 mn
