Hi,
I am extremely stuck on Question 12 Exercise 1A in the Edexcel M4 textbook. The question is: A river flows at speed u. A boat is rowed with speed v relative to the river. The width of the river is w and the boat is to reach the opposite bank at a distance d downstream. Show that, if (uv/sqrt((w^2)+(d^2)))<v<u there are two directions in which the boat may be steered.
I drew a few diagrams, but nothing helped.