book Maths Puzzle Numerical Ability

The current in a river is 5km per hour downstream. A motorboat can go downstream a distance X miles in one third the time it takes to come back up the same distance. what is the sp

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book Other Question

How many gallon of milk with 4% butterfat must be mixed with 3 gallons of cream with 20% butterfat to produce milk milk containing 5% butterfat. Please solve:

x^4 - 4x^3 + 3x / x^2 -1

I get x^2 - 4x + 1 - x + 2/x^2 - 1