Question

Ten pipes of the same type can fill up a tank in 16 minutes . If two pipes go out of order , how long will the remaining pipes take to fill the tank ?

Answer 1

If x is the required number of hours then, In order to solve this problem, first, we need to find out whether the proportionality is direct or inverse.

Now, here we note that: For more number of pipes, the time required to fill is less. For less number of pipes, the time required to fill is more. Hence, there is an inverse proportionality.

10 × 16 = (10−2) x where, x is the time required. ⇒10 × 16 = 8 × x

⇒x = 10 × 16/8

= 10 × 2 = 20 mins.

Answer is 20 minutes.