A water tank can be filled by two pipes A and B in 60 minutes and 40 minutes respectively. How many minutes will it take to fill the tankfrom empty state if B is used for half the time , and A B fill it together for the other half?

Created: 7 years ago | Updated: 4 years ago

Updated: 4 years ago

30 min

40 min

42 min

57 min

None of these

Jamuna Bank Ltd Jamuna Bank Ltd - Probationary Officer - 21.12.2012 গণিত নল ও চৌবাচ্চা (Pipes and cistern)

Des

895

Best Ans:

Part filled by (A + B) in 1 minute = (1/60 + 1/40) = 1/24

Suppose , the tank is filled in x minutes

Then x/2 ( 1/24 + 1/40) = 1

x/2 × 1/15 = 1

x = 30 min

7 years ago

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Md Azizur Rahman

FOUNDER OF SATT

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