Question

Please answer this question for me...
Please give good explanations....
Also please give the shortcut to solve this question [if any]
Prefer only handwritten answers... :-). :-)

Answer 1

Explanation:

Consider angle BAC as θ

The speed u wrt still water will be along direction AC.

tan θ=a/b

Also,

tan θ= v/u

v/u=a/b

u=vb/a

Answer 2

here is the answer please find att