Question

Quantitative Aptitude.
6.A works twice as fast as B. If B can complete a piece of work independently in 12 days, then
(SSC CPO S.I. Exam. 06.09.2009)
what will be the number of days taken by A and B together to finish the work?
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Answer 1

Step-by-step explanation:

B'S one day work=1/12

A'S one day work=2(1/12)=1/6

(A+B) one day work=(1/12)+(1/6)=1/4

hence A and B together complete the work in 4 days

Answer 2

Answer:

Ratio of rates of working of A and B = 2 : 1.

So, ratio of times taken = 1 : 2.

B's 1 day's work =121

∴A's one day's work=61(2 times the work of B)

(A+B)'s one day's work=61+121=123=41

So,A and B together can finish the work in 4 days.

Step-by-step explanation:

HOPE IT IS HELPFUL