If a motorboat travels 25km/h towards the sea, down a river whose velocity is 4km/h what is the boats velocity related to the shore?
A, 21 km/h
B, 29km/h
C, 25 km/h
D, 4 km/h
29 km/hr
To find the boat's velocity relative to the shore, we need to add the velocity of the boat (25 km/h) to the velocity of the river (-4 km/h) since they are moving in opposite directions.
Therefore, the boat's velocity relative to the shore is 25 km/h + (-4 km/h), which is equal to 21 km/h.
So, the correct answer is A: 21 km/h.