1. The problem asks: If distance is measured in kilometers (km) and time is measured in minutes (min), what will be the unit for speed? 2. Speed is defined as the rate of change of distance with respect to time. The formula for speed is: $$\text{speed} = \frac{\text{distance}}{\text{time}}$$ 3. Given distance in kilometers and time in minutes, substituting these units into the formula gives: $$\text{speed} = \frac{\text{km}}{\text{min}}$$ 4. Therefore, the unit for speed in this case is kilometers per minute (km/min). 5. To summarize, when distance is in kilometers and time is in minutes, speed is expressed in kilometers per minute.