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Pipes A and B are filling pipes while C ...

Pipes A and B are filling pipes while C is an emptying pipe. A and B can fill a tank in 72 and 90 minutes respectively. When all the three pipes are opened together, the tank gets filled in 2 hours. A and B are opened together for 12 minutes, then closed and C is opened. The tank will be empty after :
पाइप A और B भरने वाले पाइप हैं जबकि पाइप C खाली करने वाला पाइप है | A और B किसी टंकी को क्रमशः 72 और 90 मिनट में भर सकते हैं | जब इन तीनों पाइप को एक साथ चालू कर दिया जाता है, तो टंकी 2 घंटे में भर जाती है | A और B को 12 मिनट तक एक साथ चालू किया जाता है, फिर बंद करके C को चालू किया जाता है | टंकी कितने समय बाद खाली हो जाएगी ?

A

18 minutes

B

16 minutes

C

15 minutes

D

12 minutes

Text Solution

Verified by Experts

The correct Answer is:
A
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