Total distance = Sum of distances for each part. Keep \( x \) as a variable.<br><br>
&bull; Part 1: \( x \times 2 = 2x \) km<br>
&bull; Part 2: 50 × 3 = 150 km<br>
&bull; Total distance = \( 2x + 150 \) km<br><br>
Final Answer: \( 2x + 150 \)