Question

please help me to solve it :)​

Answer 1

Answer:

3km/hr

Step-by-step explanation:

Let's speed of stream = x km/hr

Then(15/9+x) +(15/9-x)=3+(3/4)hr

15(9-x+9+x/81-x2) =(15/4)

72=81-x2

:x2 =81-72

:x=3km/hr

Answer 2

Answer:

I hope it is helpful for you