book Maths Puzzle Numerical Ability

The diameter of the Milky Way disc is approximately 9 x 10^20 meters. How long does it take light, traveling at 10^16 m/year to travel across the diameter of the Milky Way?

Thank You.

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book Other Question

Determine whether the following pairs of lines are parallel, perpendicular or neither.

A) 2x + y = 1 and x-2y-1

b) 3x-y + 2= 0 and 3x + y = 0

C) y = 2x - 1 and 2x-y + 3=0 Can someone help me with this problem?

Write the ratio 5 to 9 as a fraction.

Thanks,
Sher