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Sagot :

AYUDA

bjr

       30 km ..................24 min

=      30 km ................1440 sec             puique 1 min = 60 sec

= 30 000 m .............. 1440 sec

        n  m ................... 1 sec

4eme proportionnelle

n = 30 000 x 1 : 1440 ≈ 20,83 m / s

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