പൈപ്പ് X, Z എന്നിവയ്ക്ക് 18 മണിക്കൂറും 4 മണിക്കൂറും കൊണ്ട് ഒരു ടാങ്ക് നിറയ്ക്കാൻ കഴിയും. പൈപ്പ് X 9:00 a.m നും പൈപ്പ് Z 4:00 p.m നും തുറന്നാൽ, ഏത് സമയത്താണ് ടാങ്ക് നിറയുക?
A6:00 pm
B4:00 pm
C5:00 am
D9:00 pm
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