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O 01 UISL25. A tank can be filled with water by twopipes A and B together in 36 minutes.If the pipe B was closed after 30minutes, the tank is filled in 40minutes. The pipe B can alone fill thetank in(1) 45 minutes(2) 60 minutes(3) 75 minutes (4) 90 minutes(5) of these |
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Answer» 75 min is the best answer for this. sum let(A+B)(A+B)fills 1 litre in 1 minutes then(A+B)(A+B)fills in 36 minutes = 36 litres According to question (A+B)(A+B)work only for 30 minutes then pipe filled by(A+B)(A+B)in 30 minutes is = 30 litres remaining part =(36−30)=6(36−30)=6litres 6 litres part filled by A in =10 minutes 1 part filled by A=106106minutes 36 part filled by A =106×36106×3660 minutes A+B=36A+B=36minutes A=60 minutes A's efficiency = 3 litres/minute B's efficiency = 2 litres/minute. B can alone fill the tank in =T.CeffofB=1802=90T.CeffofB=1802=90minutes 75 minutes OK thankyou 90 minutes is the right answer of the following 75 minutes is the answer of this particular question 4 is the answer of these questions |
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