The ratio of the times taken by tap A to fill the bathtub to that taken by tap B is 5:6. If tap A takes 36 minutes to fill a bathtub, how long would tap B take to fill the same bath tub?
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12 minutes:
The Hot tap fills 1/30th of the bath in 1 minute. The cold tap fills 1/20th of the bath in one minute. In one minute both taps together will fill (1/30 + 1/20) of the bath, which is 5/60ths or 1/12th of the bath. Since it takes one minute to fill 1/12th of the bath, it’ll take 12 minutes to fill the bath
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