10. Pipe A can fill a tank in 10 hours and
together pipes A and B can fill the tank in
6 hours. In what time will pipe B fill the tank?
(a) 13 hours
(b) 12 hours
(c) 15 hours
(d) 18 hours
11. A tap can fill the cistern in 8 hours and
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Answer:
15 hours
Step-by-step explanation:
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