exam Maths Puzzle Numerical Ability

The intake pipe can fill a tank in 4 hours when the outlet pipe is closed, but with the outlet pipe open it takes 6 hours. How long would it take the outlet pipe to empty a full tank?

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exam Other Question

FIND THE HORIZONTAL ASYMPTOTE, IF ANY, OF THE RATIONAL FUNCTION.
f(x)=9x cubed-5x-9 over 4x cubed-9x+4
A)None
B)y=5/9
C)y=0
D)y=9/4 Why does the inequality sign change when both sides are multiplied or divided by a negative number? Does this happen with equations? Why or why not? Give examples.