Answer:
27 kilometers
Step-by-step explanation:
Pete traveled 20 kilometers from Chesterton to Watertown. Then, he traveled 2 kilometers from Watertown to Salem. Finally, he traveled 5 kilometers from Salem to Riverside.
To find the total distance, we add these three distances together:
20 km + 2 km + 5 km = 27 kilometers
Therefore, Pete's train ride was 27 kilometers long.