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Explanation:

Tap X does a units of work in 1 hour.

∴ Tap Y does 1.6a units of work in 1 hour.

∴ In 1 hour Tap X and Y together do 2.6a units of work.

∴ Work done by Tap X and Y in 40 hours = 2.6a × 40

∴ Time taken by Tap Y alone to do this work

2.6a×401.6a = 65 hours

Hence, option (b).

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