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Exams - CAT

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?

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