Time and Work Practice Test 5 with solutions

Question : 4 of 30

Marks: +1, -0

A can do a piece of work in 25 days and B can do it in 20 days. They work together for 5 days and then A goes away. In how many days will B finish the remaining work?

33 days
20 days
11 days
10 days

Validate

Solution:

(A + B)'s 5 days' work =

5/{25}+5/{20}

1/5 + 1/4

9/{20}

Remaining part of work = 1

- 9/{20}

{11}/{20}

; which will be done by 'B';
Hence, number of days taken by B =

{{11}/{20}}/{1/{20}}

= 11 days.
Therefore, B will finish the remaining work in 11 days.

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