book Maths Puzzle Numerical Ability

Two trains start form the same place at the same time heading in directly opposite directions. One train averages 65 mph, and the other train averages 75 mph. After how long will

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logy = log16 + log49


 How can i solve by completing the square? I know a bit how but i just need some help!

X^2-X-1=0

X^2-X=1

X^2-x/2=1/2

X^2-x/2+(-1/4)^2=1/2+(-1/4)^2

I get lost here can some one help me solve or make any corrections THNX!