book Maths Puzzle Numerical Ability

One gear turns 33&1/3 times in a minute. Another gear turns 45 times in a minute. Initially, a mark on each gear is pointing due north. After how many seconds will the two gears next have both their marks pointing due north?

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book Other Question

If xy=-3 and x2+ y2=12 then (x-y)2=?
note: the "2" behind the varibles mean squared. and the (x-y)2 means squared.
thanks
Dean
xy=-3
2xy=-6
x2+y2=12
x2+y2-2xy=12-2xy
(x-y)2=12-*-6
(x-y)2=12+12
(x-y)2=24 Write an equation of the line that is parallel to the given line and passes through the given point.

32.)y=2x+2, (3,2)