Time and Work Practice Test 5 with solutions

Question : 18 of 30

Marks: +1, -0

Working alone, Sanjay and Mohan can finish a work in 30 and 42 days respectively. In how many days can they finish the same work if they work together?

$17 1/2$
15
20
35
None of these

Validate

Solution:

Work done by Sanjay in one day =

1/{30}

Work done by Mohan in one day =

1/{42}

Work done by both in one day =

1/{30}+1/{42}

{12}/{210}

So total time taken to finish the work =

{210}/{12}

Time taken to finish double of the work =

2× {210}/{12}

= 35 days

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