Bonjour
4/15 + 1/4+ 17/60 =
16/60 +15/60+ 17/60=48/60
60/60 -48/60 = 12/60
12/60 -> 14mn
1/60 -> 14/12
16/60 -> (14*16)/ 12 => 18,66mn
15/60 -> (14*15)/ 12 => 17,5mn
17/60 -> (14*17)/12 => 19,83mn
Total:
14 +18,66+17,5+19,83 =69,99
0,99mn ≈1mn
69,99 = 60 + 9 +0,99 => 1h 10mn