Answer:
70 km
Step-by-step explanation:
Before answering, let's remind the difference between distance and displacement:
- Distance: the total length of the path covered, no matter in which direction
- Displacement: the distance in a straigth line between the final point and the starting point of the motion
In this problem, we are asked to find the total distance travelled. So, we can simply add the length of the two parts of the path, regardless of their direction:
d = 30 km + 40 km = 70 km