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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:
5Q:
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:
- 1$$18{1\over 4}$$false
- 2$$19{1\over }$$true
- 3$$18{1\over 3}$$false
- 4$$19{19\over 4}$$false
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