exam Maths Puzzle Numerical Ability

A maintenance crew requires between 30 min and 45 min to prepare an aircraft for its next flight. How many aircraft can this crew prepare for flight in a 6-hour period of time?

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can you help me with this problem please
write an equation in slope-intercept form that satisfies each condition.
passes through (4,5) and is parallel to x+2y=4

i did it like this 4+2(5)=4 im not sure if thats right... please help I need find the inverse of the following function:
f(x)=2(x+12).

This is not from a test