exam Maths Puzzle Numerical Ability

How can I answer this question. Kindly help me.

3: Which expression is the LCD for 3x-1/ 2^2.3.x^2(x+2) and 2x+7/ 2.3^2.x(x+2)^2

1. 2�3�x(x + 2)
2. 36x(x + 2)
3. 36x2(

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( -5 {{{ sqrt (x)}}} + {{{sqrt (y)}}}) ({{{ sqrt (x-4)}}} {{{sqrt (y)}}})
Simplify, Multiply a jet takes the same time to travel 2580 km with wind as it does to travel 1800 km against the wind. if the speed relative to air is 450km/hr what is the speed of wind