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Sagot :

Réponse :

Explications étape par étape

1min___60sec

Xmin__21sec

X=21/60=0.35

DONC 1_3.35 MIN

1min _____1/60heure

Xminute___4,7h

X=4.7x60=282min

A) On a :

1min--)60s

Xmin--)21s

X=21×1/60

=0.35

Donc: 21s=0,35min

On a :

1min--)60s

3min--)Y

Y=60×3/1

=180s

Donc: 3min=180s

B) On a:

1min--)1/60h

Xmin--)4,7h

X=4.7x60

=282min

Donc: 4,7h=282min

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