ഒരു ടാപ്പിന് 8 മണിക്കൂർ കൊണ്ട് ടാങ്ക് നിറയ്ക്കാൻ കഴിയും, മറ്റൊരു ടാപ്പിന് 12 മണിക്കൂർ കൊണ്ട് അത് ശൂന്യമാക്കാം. രണ്ട് ടാപ്പുകളും ഒരേസമയം തുറന്നാൽ, ടാങ്ക് നിറയ്ക്കാനുള്ള സമയം:
A16 hours
B24 hours
C20 hours
D30 hours
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