Question

3. Pipes A and B can fill a tank in 5 and
6 hours respectively. Pipe C can
empty it in 12 hours. If all the three
pipes are opened together, then the
tank will be filled in: *
O (60/18) hours
O (30/17) hours
0 (8/17) hours
O (60/17) hours

Answer 1

Answer:

60/17 hours

Step-by-step explanation:

The LCM of 5,6 and 12 is 60. So consider the tank can have 60 ltr. At all. A can fill in 5 hours so in 1 hour it can fill 12 unit B can fill 10 unit and C can empty 5 unit So in one hour A+B-C =12+10-5=17 In one hour three pipe can fill 17 unit and they have to fill 60 unit So total tank will be filled in 60/17 hours.