alleryदोन नळ एक टाकी अनुक्रमे 20 आणि 30 तासांत भरतात, आणि तिसरा नळ ती 60 तासांत रिकामी करतो. सर्व नळ उघडे असल्यास, टाकी भरेल:
A15 तास
B18 तास
C10 तास
D12 तास
Answer & Solution
Correct answer: A. 15 तास
निव्वळ दर प्रति तास 3/60 + 2/60 - 1/60 = 4/60 = 1/15 आहे, म्हणून 15 तास.
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