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dan 15 menit= 15.60. sekon
= 900 sekon
1 km = 1000 m
1 jam = 3600 sekon
A. 15 menit = 15 x 60 sekon
= 900 sekon
B. 76 km/jam = 76 x 1000/3600 m/s
= 21,1 m/s