# R5 | x-ai/grok-4.3 | run 2

## Prompt

How many kilometers are in 100 miles? Show the conversion factor and cite a source for it.

## Response

100 miles equals exactly 160.9344 kilometers using the standard conversion factor of 1 mile = 1.609344 kilometers.

## Conversion Factor
The exact factor derives from the 1959 international yard and pound agreement, which defines 1 international mile as precisely 1,609.344 meters or 1.609344 kilometers.[[1]](https://en.wikipedia.org/wiki/Mile)

## Calculation
Multiply the distance in miles by the factor:  
\[ 100 \times 1.609344 = 160.9344 \] kilometers.

## Authoritative Source
This value aligns with NIST guidance on metric conversions and the fixed definition in the SI system.[[2]](https://www.nist.gov/pml/owm/metric-si/unit-conversion/approximate-conversions-us-customary-measures-metric)

What specific context or precision level do you need for this conversion?
