Question

12. One to fills a bath in 12 minutes and another tap fills it in 15 minutes. The waste-pipe can empty the
bath to 10 minutes. In what time will the bath be filled if both taps are turned on and if the waste-pipe
has been left open accidentally?

Answer 1

1/12+1/15=9/60

9/60=3/20

3/20-1/10=1/20

in 20 min bath will full