Question

Your pump empties the water from a swimming pool in 8 hours. When your friend's pump is used together with your pump, the pool is emptied in 2
hours and 40 minutes. How long (in hours) does it take your friend's pump to empty the pool when working alone?

Answer 1

Answer:

4 Hr.

Step-by-step explanation:

Given,

Your pump alone can empties the water in = 8 hrs

With the help of friend pump it take = 2.67 hr

time taken by friends to empty the whole tank = t = ?

We have,

$\dfrac{1}{8}+\dfrac{1}{t}= \dfrac{1}{2.67}$

$\dfrac{1}{t}= \dfrac{1}{2.67}-\dfrac{1}{8}$

$\dfrac{1}{t}=0.2499$

$t = \dfrac{1}{0.2499}$

$t = 4\ hrs$

Time taken to empty the tank by the friends pump alone is equal to 4 Hr.