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1 km - 1000 metres so 1 million metres = 1000 km.
120 km in 1 hour 20 km in (1/120) x 20 = 1/6 hour or 10 minutes
the road is a
1/217th of an hour = 16.59 seconds (rounded)
1 km = 1000 m 1 m = 100 cm ⇒ 1 km = 100 000 cm