book Maths Puzzle Numerical Ability

Kathy can paddle her kayak 6 miles per hour in still water. It takes her as long to paddle 3 miles upstream as 4 miles downstream in the Wabash River. Determine the rivers current.

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book Other Question

prove that each number is rational by finding a pair of ntegers whose ratio or quotient is equal to the number
1. 3.56
2. -0.000230
3. -1.6 with a line over the 6
4. 5 3/8
2x-3y+5z=-5, 2y-3z=4, and 4z=-8