Question 1

How do I convert km/h to mph?

Accepted Answer

Multiply km/h by 0.621371. For example, 100 km/h × 0.621371 = 62.14 mph. The conversion factor comes from 1 mile = 1.60934 km.

Question 2

What is a knot in km/h?

Accepted Answer

One knot equals exactly 1.852 km/h. A knot is one nautical mile per hour, used in aviation and maritime contexts. 100 knots = 185.2 km/h.

Question 3

What is the speed of sound?

Accepted Answer

The speed of sound in dry air at 20°C is approximately 343 m/s (1,235 km/h or 767 mph). It varies with temperature — about 0.6 m/s per degree Celsius.

Question 4

How fast is 1 m/s in km/h?

Accepted Answer

1 m/s = 3.6 km/h. Simply multiply by 3.6 to convert meters per second to kilometers per hour. This is because there are 3600 seconds in an hour and 1000 meters in a kilometer.

Question 5

What speed units are used in different countries?

Accepted Answer

Most countries use km/h for road speeds (Europe, Asia, Australia). The US uses mph. Aviation and shipping use knots worldwide. Scientists typically use m/s (SI unit).

Question 6

What is the average walking speed?

Accepted Answer

Average walking speed is about 5 km/h (3.1 mph or 1.4 m/s). A brisk walk is around 6-7 km/h. Running speed for a casual jogger is typically 8-12 km/h.

Question 7

What is the fastest land speed record?

Accepted Answer

The fastest land speed record is 1,227.98 km/h (763 mph or 341 m/s), set by ThrustSSC in 1997. This was the first supersonic land speed record.

Question 8

How do ft/s and m/s relate?

Accepted Answer

1 m/s = 3.28084 ft/s. Feet per second is commonly used in the US, especially in ballistics and engineering. To convert, multiply m/s by 3.28084.

Reference	km/h	mph	m/s	knots
Walking	5	3.1	1.4	2.7
Cycling	25	15.5	6.9	13.5
City driving	50	31.1	13.9	27.0
Highway	120	74.6	33.3	64.8
Commercial jet	900	559	250	486
Speed of sound	1,235	767	343	667

Speed Converter

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