Question

07. Two pipes A and B can fill a tank in 12 minutes and 15 minutes respectively. If both the pipes are opened
simultaneously, and the Pipe A is closed after 3 minutes, then how much more time will it take to fill the tank by
Pipe B?
(a) 7 min 15 sec
(b) 7 min 45 sec (c) 8 min 5 sec (d) 8 min 15 sec
​

Answer 1

Explanation:

Part fill in 3 minute=3×(

12

1

+

15

1

)

⇒3×

60

9

=

20

9

Remaining part=1−

20

9

=

20

11

⇒

15

1

:

20

11

=1:X

⇒X=

20

11

×

1

15

⇒X=8.25minute

So it will take further 8 mins 15 seconds to fill the bucket.

Answer 2

Answer:

It would be D ;)

Explanation: