How many in in 50 km?

A kilometer (km) is a unit of length within the International System of Units (SI), which is a decimal multiple of the meter. The kilometer, a common measure of distances equals to 1000 meters, and equivalent to 3280.8 feet or 0.621 mile. Abbreviation: km

Here are more examples of things that measure about one kilometer (order of magnitude):

The length of a standard Olympic running track
The distance between two subway stations in some cities
The distance of a short car trip within a city
The distance from the base to the peak of a mountain
The distance between two landmarks in a city
The length of some organized road races
The distance of a typical cycling sprint race
The distance covered by an average person during a 10-15 minute walk.

An inch is a unit of length or distance in a number of systems of measurement, including in the US Customary Units and British Imperial Units. One inch is defined as 1⁄12 of a foot and is therefore 1⁄36 of a yard. According to the modern definition, one inch is equal to 25.4 mm exactly.

The inch is abbreviated as "in" or sometimes as double quotes ("), especially when referring to the size of a screen or display.

Inches are commonly used to measure the length, width, or height of various objects, such as:

The diagonal size of computer or TV screens is often expressed in inches.
The size of furniture, such as tables, desks, or shelves, may be expressed in inches.
Clothing sizes, such as the length of pants or the circumference of a waist, may be expressed in inches.
The size of paper, such as letter or legal size, is often expressed in inches.
The dimensions of construction materials, such as lumber or drywall, are often expressed in inches.

Overall, the inch is a widely used unit of measurement for expressing length or distance in many different contexts and applications in the United States and other countries that use the customary or imperial systems of measurement.