Bonjour pouvez vous m’aider merci

Bonjour,

Convertir en secondes:

1 mn= 60 s

1 h= 360 mn= 3 600 s

25 mn 12 s= 25x60+12= 1 512 s

5 h 39 mn 36 s = 5x3 600+39x60+36= 18 000+2 340+36= 20 376

Convertir en h, mn , s:

1.64 h=1 h+0.64 h= 1h+(0.64x1h)=1h+(0.64x60)=1h+38.4mn=1h+38 mn+(0.4x60)

         = 7h38 mn 24s

2.415h= 2h+ (0.415x60)= 2h+24.9mn= 2h+ 24 mn+ (0.9x60)= 2h+24 mn +54s