NIFT UG 2020 Question Paper with solutions

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Question : 24 of 150

Marks: +1, -0

If

x

can finish a job in

4 {h}

and

y

can finish the same job in 8 h independently, then they together will finish the job in

$160 {min}$
$150 {min}$
$140 {min}$
$120 {min}$

Solution:

Time taken by

x=4 {h}

and Time taken by

y=8 {h}

Now, time taken by

x

and

y

in

1 {h}=\;{1}/{4}+\;{1}/{8}

=\;{2+1}/{8}=\;{3}/{8}

∴

Time taken by

x

and

y

together

=\;{8}/{3} {h}

or

160 {min}

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