Time and Work Practice Test 3 with solutions

Question : 3 of 40

Marks: +1, -0

A, B and C working alone can do a work in

9 2/7, 4 1/3

and

2 1/6

days respectively. How long they will take working together?

Solution:

Work done by A in one day =

7/{65}

Work done by B in one day =

4/{13}

Work done by C in one day =

6/{13}

Work done by A, B and C in one day
=

7/{65}+4/{13}+6/{13}

{7+15+30}/{65}

{52}/{65}

4/5

So, time taken =

(5/4)

days =

1 1/4

days

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