If two pipes can fill a tank in 20 minutes & 30 minutes respectively. If both the pipes are opened simultaneously, then the tank will be filled in
A10 minutes
B15 minutes
C12 minutes
D18 minutes
A10 minutes
B15 minutes
C12 minutes
D18 minutes
Related Questions:
A can do th of a work in 4 days and B can do th of the same work in 5 days. In how many days they can finish the work, if they work together?