Two pipes can fill a cistern separately in 10 hours and 15 hours. They can together fill the cistern in
Q. Two pipes can fill a cistern separately in 10 hours and 15 hours. They can together fill the cistern in
Answer: 6 hours
Notes: Part of the cistern filled by both pipes in 1 hour = $latex \frac{1}{10}+\frac{1}{15} = \frac{3+2}{30} = \frac{1}{6}&s=1$ ∴ The cistern will be filled in 6 hours, hence option [C] is the right answer.