person walking - 1.5 m/s, person running - 3 m/s, person cycling - 6 m/s, car - 25 m/s, train - 55 m/s, aeroplane - 250 m/s, speed of sound in air - 330 m/s, speed of light in vacuum - 300,000,000 m/s, speed of sound in water - 1500 m/s,

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