Question

answer it ? ?????????​

Answer 1

speed of water = x

speed of stream =y

speed upstream = x - y

speed downstream = x+ y

time = distance / speed

30/x-y + 28/x+y = 7 -------equation1

21/x-y + 21/ x+y + 5 --------equation 2

  SOLVE equation1 AND equation 2 TO GET x AND y  by takind 1/x-y as v and 1/x+y as u