Question

a river 1000 ft wide is flowing north at a constant rate 40ft/s. A ferry boat starts at pt A on the east bank and proceeds across the river to point B on the west bank directly across from pt A. The ferry captain keeps the nose of the ferry pointed at the point B at all times. What is the minimum speed that the ferryboat must exceed, relative to the current, in order for the ferry to successfully reach point B and at this speeed what is the maximum distance the ferry is pushed downstream while crossing the river. Use Aircraft Guidance in a Crosswind as a guide