RRB Government Jobs Exams Numerical Ability Data Interpretation

Two pipes A and B are attached to a cistern. Pipe A can fill the cistern in 6hours while pipe B can empty it in 8 hours. When both the pipes are openedtogether, find the time for filling the cistern.

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RRB Other Question
A cistern is normally filled in 6 hours, but takes 2 hours more to fill itbecause of a leak at its bottom. If the cistern is full, how long will it take forthe leak to empty the cistern The efficiency of the first machine tool is 20% less than that of the 2nd one. The first machine tool operated for 5 hours, whereas, the second oneoperated for 4 hours and together they machined 4000 work pieces. Find thenumber of work-pieces machined by the first machine too