kecepatan 20m/detik setara dengan.......km/jam.pake caranya yg jelas

20 m/detik = 20 : 1.000 km / 1/3.600 jam
                  = 0,02 km x 3.600/1 jam
                  = 72 km/jam

20 m = 20/1000 = 0.02 km
1 detik = 1/3600 jam
20 m/detik = 0.02/(1/3600) km/jam = 0.02 × 3600 = 72 km/jam