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A tap fills up a tank of 1250 litres in ...

A tap fills up a tank of 1250 litres in 4 hours, whereas another tap can fill the same tank in 8 hours. An outlet tap can empty that tank in 6 hours. If all the three taps are opened simultaneously, then how much time will it take to fill the tank completely?
एक नल 4 घंटे में 1250 लीटर का टैंक भरता है, जबकि दूसरा नल उसी टैंक को 8 घंटे में भर सकता है। एक आउटलेट नल 6 घंटे में उस टैंक को खाली कर सकता है। यदि सभी तीन नल एक साथ खोले जाते हैं, तो टैंक को पूरी तरह से भरने में कितना समय लगेगा?

A

4.2 hours

B

4.5 hours

C

4.8 hours

D

5 hours

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