1/6 but it says that you need 20 characters to explain it but just trust me
Answer:
see explanation
Step-by-step explanation:
If 2 lines are perpendicular then the product of their slopes equals - 1
The equation of a line in slope- intercept form is
y = mx + c ( m is the slope and c the y- intercept )
Consider the given equations
3x - 4y = 12 ( subtract 3x from both sides )
- 4y = - 3x + 12 ( divide terms by - 4 )
y =
x - 3 ← in slope- intercept form
with slope m = 
3y = 12 - 4x = - 4x + 12 ( divide terms by 3 )
y = -
x + 4 ← in slope- intercept form
with slope m = - 
Then
× -
= - 1
Since the product of their slopes = - 1 then the lines are perpendicular
As per the problem,
The larger pump takes 40 minutes to fill the pool.
The smaller one takes 60 minutes.
When both the pumps are working , let the time taken be x minutes , then we can write

Hence, when both the pumps works together, Time taken =24 minutes.
When you square +6 or -6 you get 36. That's less than 40.
When you square +7 or -7, you get 49. That's more than 40.
So one of the square roots of 40 is between <em>+6 and +7</em>, and
the other square root of 40 is between <em>-7 and -6 </em>.