book Maths Puzzle Numerical Ability

How can i solve this?

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

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book Other Question

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 Could you help me solve this problem?

1 1/15 + 3 3/10 - 2 4/5

Thanks!