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1 jam = 3600 s
.
1. 72 km/jam = ...... m/s
72 x 1000m/1x3600s = 72.000m/3600s = 20m/s
,
2. 90km/jam = ...... m/s
90 x 1000m/1x3600s = 90.000m/3600s = 25m/s