exam Maths Puzzle Numerical Ability

The cylinder diameter is 19 depth 1.6 at the rate of 14m3 per hr.
How many hrs. will it take to empty the pool? Thanks

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Detergent Problem: Large boxes of detergent, containg 3 pounds 7 ounces, cost $2.04. Small boxes, containing 17 ounces, cost just $.71. Assume that you pay a fixed rate per ounc Our problem is how to solve the following optimization problem:
Maximize x'Dx (with regard to x) subject to x'x=1, where D is a known symmetrical (n x n)-matrix and x is unknown (