Answer-Two pipes, D and E, can fill a cistern in 26 and 78 hours, respectively, while working alone. If the...

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Two pipes, D and E, can fill a cistern in 26 and 78 hours, respectively, while working alone. LCM of 26 and 78 is 78 which can be assumed as the total work. Efficiency of D  7826  3 unitshour Efficiency of E  7878  1 unithour If the two pipes are opened together, the time taken to fill the cistern  7831  784  19.5  1912 hours

Two pipes, D and E, can fill a cistern in 26 and 78 hours, respectively, while working alone. If the two pipes are opened together, the time taken to fill the cistern is:

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