exam Maths Puzzle Numerical Ability

A 120-gallon tub has a drain which, when open, drains water at the rate of 6 gallons per minute. If the tub is empty and the drain is open, at what rate, in gallons of water per minute, must water be added to the tub so that it fills in exactly 1 hour?

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exam Other Question
simplify and state the excluded values
(x^2+x-12)/(60-5x-5x^2) a figure shows the graph of f(x) =x3 and g(x) =ax3. what can you conclude about the value of a?
a< -1
-1 <a <o
0<a <1
1<a

Please explain and thank you