exam Maths Puzzle Numerical Ability

3x-4y=5
-4x+2y=6

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The current in a stream moves at a speed of 3mph. A boat travels 45mi upstream and 45mi downstream in a total time of 8 hr. What is the speed of the boat in still water? PLease help to simplify

6 times the square root of 9 times 3 times the square root of 3