Physics
posted by James on .
A ferryboat traveling at a speed of 30 km/h attempts to cross a river with a current of 5 km/h. What is the boat's speed relative to the shore?
8 km/h
25 km/h
30.4 km/h
32.8 km/h

It is sqrt(30^2 + 5^2)= 30.4 km/h