Question

3 pumps can fill a drum in 50 minutes . how much time will require to fill the drum if 2 more pumps are added

Answer 1

Answer:

just do like this in my book the same is there but only numbers are replaced.

Step-by-step explanation:

Part of tank filled by 1st pipe in 1 minute =

20

1

Part of tank filled by 2nd pipe in 1 minute =

30

1

∴ Part of tank filled by both the pipes in 1 minute =(

20

1

+

30

1

)=

60

5

=

12

1

Time taken to fill the tank =12 minutes.