Posted by Anonymous on Monday, May 14, 2012 at 10:49am.
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?

physics  Elena, Monday, May 14, 2012 at 3:14pm
v=sqrt(30²+5²) =30.4 km/h