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Question of the Day
A chemical plant has four tanks (A, B, C and D), each containing 1000 litres of a chemical. The chemical is being pumped from one tank to another as follows:

- From A to B @ 20 litres/minute
- From C to A @ 90 litres/minute
- From A to D @ 10 litres/minute
- From C to D @ 50 litres/minute
- From B to C @ 100 litres/minute
- From D to B @ 110 litres/minute

Which tank gets emptied first and how long does it take (in minutes) to get empty after pumping starts?

(1) A, 16.66
(2) C, 20
(3) D, 20
(4) D, 25


Solution
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