Two pipes A and B can fill a tank in 20 and 30 minutes respectively . If both the pipes are used together , then how long will it take to fill the tank ?

Created: 7 years ago | Updated: 5 days ago

Updated: 5 days ago

12 min

15 min

25 min

50 min

Bangladesh Bank Bangladesh Bank - Assistant Director - 2014 গণিত নল ও চৌবাচ্চা (Pipes and cistern)

Des

730

Best Ans:

A pipe fill 1/20 portion of tank in 1 min

B pipe fill 1/30 portion of tank in 1 min

So, together pipe fill ( 1/20 + 1/30) portion of tank in 1 min

= ( 3 + 2) / 60 = 1/12

Now, they fill 1/12 portion in 1 mint

So, they fill 1 (whole) portion in ( 1×12)/1 = 12 minutes

7 years ago

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Md Azizur Rahman

FOUNDER OF SATT

গণিত

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