Aviation mixes metric and imperial constantly. Convert the units that fill pilot tests and the flight deck, with the conversion factor given each time.
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This measures speed and accuracy applying conversion factors between the units aviation actually mixes: feet and metres, knots and kilometres per hour, litres and US gallons, kilograms and pounds. Making these instant removes a common, avoidable source of error.
The factor is given each time, but knowing 1 ft = 0.3048 m, 1 NM = 1.852 km and 1 kg = 2.205 lb makes you far faster. For a quick gut check, 1 metre is roughly 3.3 ft and 1 kg is roughly 2.2 lb.
Options are spaced so a sensible rounding lands on one answer. Convert to two significant figures first, and only refine if two options sit close together. Fuel volume to mass uses density, here about 0.80 kg per litre for Jet A-1.
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