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A cistern can be filled by two pipes A and B in 4 hours and 6 hours respectively. When full, the tank can be emptied by a third pipe C in 8 hours. If all the taps be turned on at the same time, the cistern will be full in
5Q:
A cistern can be filled by two pipes A and B in 4 hours and 6 hours respectively. When full, the tank can be emptied by a third pipe C in 8 hours. If all the taps be turned on at the same time, the cistern will be full in
- 1$$ {2}{2\over 7}{\ hours}$$false
- 2$$ {3}{3\over 7}{\ hours}$$true
- 3$$ {4}{3\over 7}{\ hours}$$false
- 4$$ {2}{5\over 7}{\ hours}$$false
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