90 km/jam=......m/detik

jwb:
1km=1000 m
jadi 90 km = 90.000
1jam =3600 s
jadi 90.000:3600=25 m/s

90 km= 90.000 meter
1 jam = 3.600 detik

[tex]\frac{90000}{3600} [/tex]
= 25m/detik