SSC CGL 6 Sep 2016 Paper

Question : 51 of 100

Marks: +1, -0

A can do a piece of work in 8 days and B can do it in 10 days separately. How many days would it take for both A and B to finish the same work together ?

${33}/8$
${40}/9$
${41}/{10}$
${42}/{11}$

Validate

Solution:

A’s 1 day’s work =

1/8

B’s 1 day’s work =

1/{10}

(A + B)’s 1 day’s work =

1/8+1/{10}

{5+4}/{40}

9/{40}

∴ Required time =

{40}/9

days

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