Time and Work Practice Test 1 with solutions

Question : 34 of 40

Marks: +1, -0

Working alone A, B and C can do a work in 13, 17 and 19 days respectively. How long will they take if they work together?

Solution:

Work done by A in one day =

1/{13}

Work done by B in one day =

1/{17}

Work done by C in one day =

1/{19}

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

1/{13}+1/{17}+1/{19}

{323+243+221}/{4199}

{791}/{4199}

So, time take by all of them =

{4199}/{791}

5 {244}/{791}

days.

Go to Question:

Prev Question

Next Question