Time and Work Practice Test 2 with solutions

Question : 18 of 40

Marks: +1, -0

A man can do a job in 15 days. His father and his son can complete the same work in 20 and 25 days respectively. How long will they take to complete the job if they all work together?

More than 10 days
6.4 days
6 days
Less than 6 days

Validate

Solution:

(Man + his father + his son)'s 1 day's work =

1/{15}+1/{20} + 1/{25}

{47}/{300}

Hence, they altogether complete the work in

{300}/{47}

~ 6.4 days.

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