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 anther as follows.From A to B @ 20 litres/minuteFrom C to A @ 90 litres/minuteFrom A to D @ 10 litres/minuteFrom C to D @ 50 litres/minuteFrom B to C @ 100 litres/minuteFrom D to B @ 110 litres/minuteWhich tank gets emptied first, and how long does it take (in minutes) to get empty after pumping starts?
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