book Maths Puzzle Numerical Ability

Can you help me on this? There are different parts to this question.
1) If the demand equation for a product is given by p= -2x+24, find the marginal revenue

2) If the cost eq

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book Other Question

Denchin Donuts sells donuts for 20 cents each plus 15 cents for the box in which they come. Build a table Jim can fill a pool carrying buckets of water in 30 minutes. Sue can do the same job in 45 minutes. Tony can do the same job in 1 1/2 hours. How quickly can all three fill the pool together?

How do you solve this?