Pipe A fills a 5liter tank at a rate of 15liter per hour. Pipe B fills the same thank at a rate of 10 l/h. Pipe A runs alone for 100 minutes then the two of the

Question

Pipe A fills a 5 liter tank at a rate of 15liter per hour. Pipe B fills the same thank at a rate of 10 l/h. Pipe A runs alone for 100 minutes then the two of them together finish filling up the tank. How long does the whole operation take?

Answer 1

At 15 liter per hour, A would fill a 5 liter tank in 20 minutes, much less time than filling for 100 minutes.

Check the numbers for accuracy.