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Express (a) 50 km/hour mm/s.

(b) 60 litres in m3 cube if 1 litre = 0.001m3.

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you can always multiply by 1 without changing anything

50km/hr * 10^6mm/km * 1hr/3600s = 13888.8mm/s

60L * .001m^3/L = .06m^3

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