plz solve this question it's urgent plz fast
plz
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plz solve this question it's urgent plz fast
plz
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Answer:
1/6 hours
Step-by-step explanation:
One tap can fill a cistern in = 3 hours
Waste pipe can empty a cistern in = 2 hours
∴ One tap 1 hour work = 1/3
Waste pipe 1 hour work = 1/2
∴ One tap and waste pipe together 1 hour work
= 1/3 – 1/2 = (3 – 2)/6
= 1/6
∴ Empty cistern will be full in 1/6 hours.