Riya can complete a work in 10 days while Shilpa can complete the same work in 15 days if they both join together how many days will take complete the work
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Riya's 10 day work=1 unit,
then
Riya's 1 day work=1/10 unit,
similarly
Shilpa's 1 day work=1/15 units,
hence
Riya's and Shilpa's 1 day work together=1/10 + 1/15,
=(3+2)/30 units,
=5/30 units,
=1/6 units,
therefore
Riya's and Shilpa's done 1 unit work =6 days
then
Riya's 1 day work=1/10 unit,
similarly
Shilpa's 1 day work=1/15 units,
hence
Riya's and Shilpa's 1 day work together=1/10 + 1/15,
=(3+2)/30 units,
=5/30 units,
=1/6 units,
therefore
Riya's and Shilpa's done 1 unit work =6 days
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