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bobby

· started a discussion

· 1 Months ago

wrong (Question: 196254.0 )

answer should be option D . As we have to calculate the whole time from starting.

Question:
Two pipes A and B can fill a cistern in 20 minutes and 25 minutes respectively. Both are opened but B is closed after 5 minutes. What will be the total time taken (in minutes) to fill the cistern ?
Options:
A) 17
B) 11
C) 15
D) 16
Solution:

Suppose A takes x minutes more after 5 minutes of working together with B to fill the cistern

then,


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