Here's how to convert kilometers per hour (kph) to miles per hour (mph):

1. Conversion Factor:

* 1 kilometer (km) is approximately equal to 0.621371 miles.

2. Calculation:

* Multiply the speed in kph by the conversion factor:

18 kph * 0.621371 miles/km ≈ 11.186 mph

Therefore, 18 kph is approximately equal to 11.19 mph.