Question

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$1$ hour $=60$ minutes

Rate of emptying the tank by the two taps are $601 $ and $301 $ of the tank per minute respectively.

Rate of emptying the tank when both operate simultaneously

$=601 +301 =601+2 =603 =201 $

of the tank per minute.

$∴$ Time taken by the two taps together to empty the tank $=20$ minutes.

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