Question

Jaya and seema can together do a piece of work in 10 hours

Answer 1

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1 hour = 1/10 piece of work

Jaya alone will do the work in 15 days

In 1 hour Jaya will do = 1/15 of work

Then,

1/10 - 1/15 = x

x = 5/150

x = 1/30

so, Seema alone will do the work in 30 hours.