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| 21 Knots Admiralty | to common speed units |
|---|---|
| 21 kn[admiralty] | = 24.181802523264 miles per hour (mi/h) |
| 21 kn[admiralty] | = 0.4030300420544 miles per minute (mi/m) |
| 21 kn[admiralty] | = 0.0067171673675734 miles per second (mi/s) |
| 21 kn[admiralty] | = 38.916807666554 kilometers per hour (km/h) |
| 21 kn[admiralty] | = 0.64861268277463 kilometers per minute (km/m) |
| 21 kn[admiralty] | = 0.010810233 kilometers per second (km/s) |
| 21 kn[admiralty] | = 10.810233 meters per second (m/s) |
| 21 kn[admiralty] | = 38916.807666554 meters per hour (m/h) |
| 21 kn[admiralty] | = 21.013430033201 knots (kn) |
| 21 kn[admiralty] | = 3.6059055895262E-8 speed of light (c) |