Quantitative Aptitude :: Chain Rule - Discussion

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Explanation:
Lets assume x hrs a days required to empty tank.

Note: (u) means up arrow and (d) means down arrow.

pumps hrs days
-------------------------
3(u) 8(d) 2(u)
4 x 1

(3/4 * 2/1) = x/8
=> x = (3/4 * 2 * 8)
=> x = 12 hrs.