A chemical plant has four tanks (A, B, C and D), each containing1000 litres of a chemical. The chemical is being pumped from one tankto another 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?

A chemical plant has four tanks (A, B, C and D), each containing1000 l

1.	A chemical plant has four tanks (A, B, C and D), each containing1000 litres of a chemical. The chemical is being pumped from one tankto another 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?
A.	A, 16.66
B.	C, 20
C.	D, 20
D.	D, 25
Answer» D. D, 25