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Raj

· started a discussion

· 1 Months ago

86181.0 (Question:86181.0)

Ye 299 kanha se aaya please explain this qst

Question:
A is 30% more efficient than B. How much time working together will they take to complete a job, if A alone could have done in 23 days? 
Options:
A) 11 days
B) 13 days
C) \(20\cfrac{3}{17}\) 
D) 18 days
E) None of these
Solution:
Ans: (b)

efficiency ratio of A:B=130:100
therefore  time taken ratio=(1/130):(1/100)
                                     =10:13
 now,
if A takes 10 days then B takes 13 days.
but A takes 23 days,hence B will take (13/10)\(\times\)23=299/10 days.
hence 1 day work of  A and B together
=(1/23)+(10/299)=23/299=1/13.
hence time taken by A and B together=13 days.

amol

· commented

· 1 Months ago

23*13=299
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