book Maths Puzzle Numerical Ability

Rita rows 12km upstream and 12km downstream in 3 hours. THe speed of her boat in still water is 9km per hour. Find the speed of the stream. What would the equation look like for

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Can someone help me solve this problem?

I need to find the square root of 196

Thanks,
Sher How can i solve this?

The square root of M^2/N^3.