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Sagot :

Réponse :1 ) 3h45= 3x60+45=225 mn. 2h5= 2x60+5=125 mn. 4j25mn= 4x24x60+5=5765mn

2) 55mn=55x60= 3300 secondes. 3h45sec=3x60x60+45=10800+45=10845secondes

2h45mn=2x60x60+45x60=7200+2700=9900 secondes

Explications étape par étape

3)235mn=3x60X60+55x60=3h55mn. 7124sec=60x60+58x60+44=1h58mn44sec. 6800sec=60x60+53x60+20=1h53mn20sec

Voilà c’est fait

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