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?

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book Other Question

an airplane took 2 hours to fly 600km against a head wind. the return trip with the wind took 1 2/3 hours. find the speed of the plain in still air. A sailboat travels 20 miles downstream in 3 hours. It returns in 4 hours. Find the speed of the sailboat in still water and the rate of the current.