Question

A cistern will be filled in 9 hrs, but becoz of an outlet it is filled in 10 hrs, if the cistern is filled, then how much time the outlet takes to empty the cistern.

Answer 1

Cistern filled in one hour=1/9
Cistern filled in one hour after outlet=1/10
Difference=1/9-1/10
=
$\frac{10 - 9}{90}$
$\frac{1}{90}$
Outlet empty cistern in one hour=1/90
Outlet empty the cistern=1÷1/90
=1*90
=90hours

Answer 2

Answer:

THIS IS THE ANSWER .....