book Maths Puzzle Numerical Ability

Solve problem exactly

log 8 - log x = 2

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book Other Question

A jet plane traveling at 500mph overtakes a propeller plane traveling at 200mph that had a 2h head start. How far from the starting point are the planes? I have the answer in the b I am having some problem in sinplifying equetions
can you give me the general rule of that.