Time and Work Practice Test 3 with solutions

Question : 32 of 40

Marks: +1, -0

A, B and C can accomplish a given task in 10, 15 and 20 days respectively. How long will they take if they all work together?

Solution:

Work done by A in one day =

1/{10}

Work done by B in one day =

1/{15}

Work done by C in one day =

1/{20}

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

1/{10}+1/{15}+1/{20}

{6+4+3}/{60}

1/{60}

So, time taken =

{60}/{13}

~ 4.6 days

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