Time and Work Practice Test 1 with solutions

Question : 4 of 40

Marks: +1, -0

A can do a piece of work in 4 hours; B and C together can do it in 3 hours, while A and C together can do it in 2 hours. How long will B alone take to do it?

24 hours
12 hours
10 hours
8 hours

Validate

Solution:

(A + B + C)'s 1 hour's work =

1/4 + 1/3

7/{12}

B's 1 hour's work =

7/{12}-1/2

1/{12}

Hence, B alone will do the work in 12 hours.

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