Pipe A can fill an empty tank in 6.8 hours while pipe B can fill it in 10.2 hours. Only pipe B is turned on for 1.7 hours after which pipe A is also switched on. How long will it take to fill the cistern? (A) 5 hours 5 minutes (B) 5 hours 12 minutes (C) 5 hours 10 minutes (D) 5 hours 6 minutes
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Answer:
one hour 15 minutes
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