18 km/jam= m/detik.90m/detik= km/jam.pake caranya ya

18 km/jam = 18000 m/jam = 18000 m/3600 detik = 5 m/detik

90 m/detik = 0,09 km/detik = 324 km/jam

Maaf kalau salah

Konversi satuan.

18 km/jam = (18 x 10³ m) / (3,6 x 10³ s)
                  = 18/3,6 m/s = 5 m/s

90 m/s = (90 x 10⁻³ km) / [1 / (3,6 x 10³ jam)]
            = 90 (3,6) km/jam = 324 km/jam