book Maths Puzzle Numerical Ability

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.

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book Other Question

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. how would you solve tjis equation? Square root 4x^2+x-3=2x
I am stuck. can someone please help?