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A speed converter converts between common speed units: mph, km/h, m/s, knots, and Mach number. Speed is distance per unit time — the SI unit is meters per second (m/s), but km/h and mph are more common in everyday use.

단계별 가이드

1. 11 mph = 1.60934 km/h = 0.44704 m/s
2. 21 km/h = 0.62137 mph = 0.27778 m/s
3. 31 knot = 1 nautical mile/hour = 1.852 km/h = 1.15078 mph
4. 4Mach 1 ≈ 343 m/s = 1,235 km/h = 767 mph (at sea level, 20°C)

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