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[1km = 1000m ⇒ 1m = 10⁻³ km

1 hour = 3600s ⇒ 1s = 1 / 3600 h]

⇒ 3600/1000 km/h

The speed of a moving car = 20 m/s

= 20 x 18/5 km/h

1 hour = 3600s ⇒ 1s = 1 / 3600 h]

**m/s**⇒ 1m / 1s ⇒ 10⁻³ km / (1/3600) h⇒ 3600/1000 km/h

**= 3.6 km/hour = 18/5 km/h**The speed of a moving car = 20 m/s

= 20 x 18/5 km/h

*= 72 km/h*1 km × 1000 m = 1000 km · m

h 1 km h · km Now "cancel out" any units that are both top and bottom: 1000 km · m = 1000 m

h · km h