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vivek

· started a discussion

· 1 Months ago

Give explanation with shortcut (Question: 326214.0 )

yaar yeh explanation hai? itna brute force method..Class mein bhi aise hi karwate hai kya paramount wale?kuch shortcut se diya karo..Aise method se to 5 min isi question pe nikal jayege

Question:
A swimming pool has 3 drain pipes. The first two pipes A and B, operating simultaneously, can empty the pool in half the time than that of taken by C alone. Pipe A, working alone, takes half the time taken by pipe B. Together they take 6 hrs 40 minutes to empty the pool. Time taken by pipe A to empty the pool, in hours, is:
Options:
A)

10

B)

15

C)

30

D)

7

Solution:

Ans: (b)


Vikas Singh

· commented

· 1 Months ago

(a+b)/c=2/1 nd a/b=2/1 ratio of effice now (a+b+c)*20/3=a*t find a:b:c nd put

Knowledge Expert

· commented

· 1 Months ago

Dear Student,
Short Solution:
A=2B
3B=2C
A:B:C=4:2:3
Total empty in one minute =9
Then total capacity =9*(6hr 40minute) =9*20/3
A emptied 4 in one minute then total time taken by A=9*(20/3)/4=15hr
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