Thirty men can complete a work in 36 days. In how many days can 18 men complete the same piece of work?
A48
B36
C60
D72
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ഒരു ടാങ്കിൻറ നിർഗമന കുഴൽ തുറന്നാൽ 2 മണിക്കൂർ കൊണ്ട് നിറയും. ബഹിർഗമന കുഴൽ തുറന്നാൽ 3 മണിക്കൂർ കൊണ്ട് ടാങ്ക് കാലിയാവും. രണ്ട് കുഴലുകളും ഒരുമിച്ച് തുറന്നാൽ എത്ര സമയം കൊണ്ട് ടാങ്ക് നിറയും?