Two pipes A and B can fill a tank in 20 minutes and 30 minutes,
Two pipes A and B can fill a tank in 20 minutes and 30 minutes, respectively. A third pipe C can empty the tank in 40 minutes. If all three pipes are opened simultaneously, how long will it take to fill the tank? (Rounded off to 2 decimal places.)
दो पाइप A औरB एक टंकी को क्रमशः 20 मिनट में भर सकते हैं। एक तीसरा पाइप C, टंकी को 40 मिनट में खाली कर सकता है। यदि तीनों पाइप एक साथ खोल दिए जाएं, तो टंकी को भरने में कितना समय लगेगा? (दशमलव के बाद 2 स्थानों तक पूर्णांकित)
Detailed Solution & Logic
Correct Answer:
17.14 मिनट
Net rate = $ \dfrac{1}{20} + \dfrac{1}{30} - \dfrac{1}{40}$
$= \dfrac{6}{120} + \dfrac{4}{120} - \dfrac{3}{120}$
$= \dfrac{7}{120}$
Time = $ \dfrac{120}{7}$
= 17.14 minutes
Answer 17.14 मिनट
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