exam Maths Puzzle Numerical Ability

2r+2s=50 and 2r-s=17

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Solve the equation exactly for x: log3 x-log3(x-3)=2 Mary leaves San Francisco and travels toward Los Angeles at 50 mi/h. An hour later, Phil leaves Los Angeles and travels toward San Francisco at 60 mi/h. If the two cities are 380 miles apart, how many hours will it take for Mary to meet Phil?