എ, ബി പൈപ്പുകൾക്ക് യഥാക്രമം 5, 6 മണിക്കൂർ കൊണ്ട് ഒരു ടാങ്ക് നിറയ്ക്കാനാകും. പൈപ്പ് സി 12 മണിക്കൂറിനുള്ളിൽ ഇത് ശൂന്യമാക്കും. മൂന്ന് പൈപ്പുകളും ഒരുമിച്ച് തുറന്നാൽ എപ്പോൾ ടാങ്ക് നിറയും?
A1 13/17
B2 8/11
C3 9/17
D4 1/2
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