Answer:
210km
Step-by-step explanation:
Given parameters: 
Distance traveled northward = 150km 
Distance traveled westward = 60km 
Unknown: 
Total distance traveled by the train = ? 
Solution: 
Distance is the total length of path traveled by a body. 
 Total distance = distance traveled northward + distance traveled westward
Total distance = 150km + 60km = 210km