Réponse:
à =1512 secondes
b= 20376 secondes
Explications étape par étape:
à 1,64h= 1h38min24s
b 2,415h = 2h24min 54 s
Réponse :
a) 25×60s + 12 = 1500+12 = 1512 secondes
b)5×3600s+39×60s+36 = 18000+2340+36 = 20376 secondes
(1h=60min=60s×60=3600s)
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