Answer: The distance between the two ships is 24.1 km.
Explanation:
Since we have given that
Distance due to north = 20 km
Distance due to east = 13.5 km
We need to find the distance between the two ships:
Since it forms right angled triangle:
So, we will apply "Pythagorus theorem":

Hence, the distance between the two ships is 24.1 km.