Two pipes A and B can fill a tank in 10 h and 15 h Respectively. Find the time taken to fill the tank when both the pipes are turned on simultaneously:

6 h

Two pipes A and B can fill a tank in 10 h and 15 h Respectively

Pipe A's 1 hour work = 1/10

Pipe B's one hour work = 1/15

If both ARE TURNED ON TOGETHER, ONE HOUR WORK = 1/10 + 1/15 = (3+2)/30 = 1/6

Thus total time taken if Pipe A and B are turned on together = 6 hours

The correct answer is Option (2) → 6 h