| speed of sound (68 °F) | 1 s | 2 s | 3 s | 4 s | 5 s | 6 s | 7 s | 8 s | 9 s | 10 s | 11 s | 12 s | 13 s | 14 s | 15 s | 16 s | 17 s | 18 s | 19 s | 20 s | 21 s | 22 s | 23 s | 24 s | 25 s | 26 s | 27 s | 28 s | 29 s | 30 s | 31 s | 32 s | 33 s | 34 s | 35 s | 36 s | 37 s | 38 s | 39 s | 40 s | 41 s | 42 s | 43 s | 44 s | 45 s | 46 s | 47 s | 48 s | 49 s | 50 s | 51 s | 52 s | 53 s | 54 s | 55 s | 56 s | 57 s | 58 s | 59 s | 60 s | 61 s | 62 s | 63 s | 64 s | 65 s | 66 s | 67 s | 68 s | 69 s | 70 s | 71 s | 72 s | 73 s | 74 s | 75 s | 76 s | 77 s | 78 s | 79 s | 80 s | 81 s | 82 s | 83 s | 84 s | 85 s | 86 s | 87 s | 88 s | 89 s | 90 s | 91 s | 92 s | 93 s | 94 s | 95 s | 96 s | 97 s | 98 s | 99 s | 100 s |
| kilometers per hour | 1,234.8 km/h | 2,469.6 km/h | 3,704.4 km/h | 4,939.2 km/h | 6 174 km/h | 7,408.8 km/h | 8,643.6 km/h | 9,878.4 km/h | 11,113.2 km/h | 12 348 km/h | 13,582.8 km/h | 14,817.6 km/h | 16,052.4 km/h | 17,287.2 km/h | 18 522 km/h | 19,756.8 km/h | 20,991.6 km/h | 22,226.4 km/h | 23,461.2 km/h | 24 696 km/h | 25,930.8 km/h | 27,165.6 km/h | 28,400.4 km/h | 29,635.2 km/h | 30 870 km/h | 32,104.8 km/h | 33,339.6 km/h | 34,574.4 km/h | 35,809.2 km/h | 37 044 km/h | 38,278.8 km/h | 39,513.6 km/h | 40,748.4 km/h | 41,983.2 km/h | 43 218 km/h | 44,452.8 km/h | 45,687.6 km/h | 46,922.4 km/h | 48,157.2 km/h | 49 392 km/h | 50,626.8 km/h | 51,861.6 km/h | 53,096.4 km/h | 54,331.2 km/h | 55 566 km/h | 56,800.8 km/h | 58,035.6 km/h | 59,270.4 km/h | 60,505.2 km/h | 61 740 km/h | 62,974.8 km/h | 64,209.6 km/h | 65,444.4 km/h | 66,679.2 km/h | 67 914 km/h | 69,148.8 km/h | 70,383.6 km/h | 71,618.4 km/h | 72,853.2 km/h | 74 088 km/h | 75,322.8 km/h | 76,557.6 km/h | 77,792.4 km/h | 79,027.2 km/h | 80 262 km/h | 81,496.8 km/h | 82,731.6 km/h | 83,966.4 km/h | 85,201.2 km/h | 86 436 km/h | 87,670.8 km/h | 88,905.6 km/h | 90,140.4 km/h | 91,375.2 km/h | 92 610 km/h | 93,844.8 km/h | 95,079.6 km/h | 96,314.4 km/h | 97,549.2 km/h | 98 784 km/h | 100,018.8 km/h | 101,253.6 km/h | 102,488.4 km/h | 103,723.2 km/h | 104 958 km/h | 106,192.8 km/h | 107,427.6 km/h | 108,662.4 km/h | 109,897.2 km/h | 111 132 km/h | 112,366.8 km/h | 113,601.6 km/h | 114,836.4 km/h | 116,071.2 km/h | 117 306 km/h | 118,540.8 km/h | 119,775.6 km/h | 121,010.4 km/h | 122,245.2 km/h | 123 480 km/h |
The speed of sound is the distance travelled per unit time by a sound wave as it propagates through an elastic medium. In dry air at 0 °C (32 °F), the speed of sound is 331.2 metres per second (1,087 ft/s; 1,192 km/h; 741 mph; 644 kn). At 20 °C (68 °F), the speed of sound is 343 metres per second (1,125 ft/s; 1,235 km/h; 767 mph; 667 kn), or a kilometre in 2.91 s or a mile in 4.69 s.
| 1 speed of sounds (68 °F) ≈ 1234.8 kilometers per hour | 6 speed of sounds (68 °F) ≈ 7408.8 kilometers per hour |
| 2 speed of sounds (68 °F) ≈ 2469.6 kilometers per hour | 7 speed of sounds (68 °F) ≈ 8643.6 kilometers per hour |
| 3 speed of sounds (68 °F) ≈ 3704.4 kilometers per hour | 8 speed of sounds (68 °F) ≈ 9878.4 kilometers per hour |
| 4 speed of sounds (68 °F) ≈ 4939.2 kilometers per hour | 9 speed of sounds (68 °F) ≈ 11113.2 kilometers per hour |
| 5 speed of sounds (68 °F) ≈ 6174 kilometers per hour | 10 speed of sounds (68 °F) ≈ 12348 kilometers per hour |
The kilometre per hour (American English: kilometer per hour) is a unit of speed, expressing the number of kilometres travelled in one hour.
| 1 kilometers per hour ≈ 0.00080984774862326 speed of sounds (68 °F) | 6 kilometers per hour ≈ 0.0048590864917396 speed of sounds (68 °F) |
| 2 kilometers per hour ≈ 0.0016196954972465 speed of sounds (68 °F) | 7 kilometers per hour ≈ 0.0056689342403628 speed of sounds (68 °F) |
| 3 kilometers per hour ≈ 0.0024295432458698 speed of sounds (68 °F) | 8 kilometers per hour ≈ 0.0064787819889861 speed of sounds (68 °F) |
| 4 kilometers per hour ≈ 0.003239390994493 speed of sounds (68 °F) | 9 kilometers per hour ≈ 0.0072886297376093 speed of sounds (68 °F) |
| 5 kilometers per hour ≈ 0.0040492387431163 speed of sounds (68 °F) | 10 kilometers per hour ≈ 0.0080984774862326 speed of sounds (68 °F) |
| 1 speed of sounds (68 °F) ≈ 1,234.8 kilometers per hour |
| 1 kilometers per hour ≈ 0.0008098 speed of sounds (68 °F) |