2. Christopher watches a stick float downstream in a river and notices that it moves 15 m [E] in a time of 2.5 x 10 s. His friend, John, is starting on the south side of the river and is going to swim across. In still water, John knows that he can swim with a speed of 1.2 m/s, relative to the water. a) What is John's velocity relative to the shore? /3 marks) b) If the river is 1.5 km wide, how long will it take John to cross the river? /2 marks) c) How far downstream will be land? /3 marks)