Question

Sln goes 8 km downstream in 40 minutes and return in 1 hour determine the speed of cell in still water and speed of the current

Answer 1

solution:[tex]now, \frac{8}{x+y}= \frac{40}{60}\\ x+y=12    -----------1\\ \frac{8}{x-y}=1\\ x-y=8   ----------2\\ on adding 1 and 2\\ x+y+x-y=12+8\\ 2x=20\\ x=\frac{20}{2}\\ x=10\\ by the equation 1\\ 10+y=12// y=12-10\\ y=2[/tex]