Question

A water tank is two-fifth full. pipe P can fill a tank in 10 minutes, and pipe Q can empty it in 6 minutes. if both the pipes are opened, how long will it take to empty the tank completely?
a)7 min
b)6.5 min
c)6 min
d)5.5 min​

Answer 1

Answer:

c)6 mins

Step-by-step explanation:

hope it helps!

Answer 2

Answer:

There are two important points to learn in this type of question,

First, if both will open then tank will be empty first.

Second most important thing is,

If we are calculating filling of tank then we will subtract as (filling-empting)

If we are calculating empting of thank then we will subtract as (empting-filling)

So lets come on the question now,

Part to emptied 2/5

Part emptied in 1 minute =

Step-by-step explanation: