..km/jam = 1800 m/mt = … m/dt

1800 m/mnt
= 1.800 × (1 /1.000 ÷ 1 / 60)
= 1.800 × (1 / 1.000 × 60/1)
= 1.800 × 60/1000
= 108 km/jam

1.800 m/mnt
= 1.800 × 1/60
= 30 mtr / dtk

1800×60=108.000m=108km/jam=30m/detik