Pipe A is 4 times faster than pipe B and takes 30 minutes less than the Pipe B to fill the tank. In what time will this cistern be full if both pipes are open together?
1
6 mins
2
8 mins
3
12 mins
4
9 mins
5
None of these
Pipe A is 4 times faster than pipe B and takes 30 minutes less than the Pipe B to fill the tank. In what time will this cistern be full if both pipes are open together?