Bonsoir pourriez vous m'aider s'il vous plait au moins pour quelque calcul sa serait gentil merci :)

4h18mn+6h25 = 4h+6h +18mn+25mn = 10h43mn

4mn 32s +5mn 28s = 4mn+5mn +32s+28s = 9mn +60s = 10mn

7h45 +9h30 = 7+9 +(45+30mn) = 16h +75mn = 17h+15 mn

pour info 1h =60 mn donc 75mn = 1h15mn

12mn53+49mn47 = 12+49mn +53s+47s =61mn +100s = 1h 2mn 40s

17h36mn - 9h21mn = 17h-9h +36-21mn =8h15mn

12h30 - 11h15 = 12-11h +30-15 = 1h15mn

5mn12s-3mn47s = 5-3mn + 47-12 s = 2mn35s

1h24 mn -36mn25s = 60+24mn-36mn + 25 -24s =84mn -36mn +1s =48mn1s