दो नल एक टंकी को क्रमशः 2 घण� – McqOptions

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1.	दो नल एक टंकी को क्रमशः 2 घण्टे तथा 3 घण्टे में भर देते है \| यदि दोनों नल एक साथ खोल दिये जाये तो टंकी भरने में कितना समय लगेगा ?
A.	1 h 12 min
B.	1 h
C.	3h
D.	9 h
Answer» B. 1 h

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