Question

a bath tub has two taps one takes 30 min to fill alone and another takes 40 min to fill it alone and there is one more tap that empty the tub in 20 min if all the taps are opened how much time it will take to fill the tub
plz answer the question correctly or I will report ur answer​

Answer 1

Answer:

36 mins

Explanation:

A work done in 1 minute by both the taps =(

20

1

+

30

1

)=

60

5

=

12

1

Both the taps can fill the bath in 12 minutes. Clearly the waste pipe empties as much the bath in 12 minutes as the other two two taps together can fill in 4 minutes.

Work done by two taps in 4 minutes =

12

1

×4=

3

1

.

In 12 minutes, the waste pipe empties =

3

1

part.

In 1 minute, the waste pipe empties =

3

1

×

12

1

=

36

1

part.

Thus the waste pipe can empty the bath in 36 minutes.