1. (x - y) hours
  2. (y - x) hours
  3. $$\left( {\frac{{xy}}{{x - y}}} \right)\,{\text{hours}}$$
  4. $$\left( {\frac{{xy}}{{y - x}}} \right){\text{hours}}$$
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Answer: Option 4

Time will be taken by both of them to fill the tank $${\text{ = }}\frac{{xy}}{{y - x}}$$

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