Convert 30 miles into kilometers.

Step 1 ：Step 1: Understand that 1 mile is approximately equal to 1.609344 kilometers.

Step 2 ：Step 2: Set up the conversion so that the desired unit will be canceled out. In this case, we want km to be the remaining unit. \[distance_{km} = distance_{mile} \times \frac{1.609344km}{1mile}\]

Step 3 ：Step 3: Substitute the given distance in miles into the equation from step 2. \[distance_{km} = 30mile \times \frac{1.609344km}{1mile}\]

Step 4 ：Step 4: Simplify the equation to find the distance in kilometers. \[distance_{km} = 30 \times 1.609344km\]