Subject :IMO Class : Class 8
A cistern has two inlets A and B which can fill it in 12 minutes and 15 minutes respectively. An outlet C can empty the full cistern in 10 minutes. If all the three pipes then are opened together in the empty cistern, time taken to fill the cistern completely is ____.
A 20 minutes
B 10 minutes
C 15 minutes
D 5 minutes
Ans 1:
Class : Class 9
A