A boat heading due North crosses a 168-m wide river with a speed of 10.0 km/h relative to the water.
The water in the river has a uniform speed of 5.00 km/h and flows due East.
(a) What is the velocity of the boat relative to the shore?
(b) How long does it take the boat to cross the river?
(c) How for downstream does the boat end up?