Time and Work Practice Test 3 with solutions

Question : 33 of 40

Marks: +1, -0

A works twice as fast as B. If B can complete a work in 12 days independently, the number of days in which A and B can together finish the work is:

Solution:

Ratio of efficiency of A and B = 2 : 1
Hence, ratio of their time taken = 1 : 2
So, A can finish the job in 6 days.
(A + B)'s 1 day's work =

1/6 + 1/{12}

3/{12}

1/4

Hence, they together will finish the job in 4 days.

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