exam Maths Puzzle Numerical Ability

y=1/3x+3
y=1-3x-3

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Ozark furniture company can obtain at most 3000 board feet of maple lumber for making its classic and modern maple rocking chairs. A classic maple rocker requires 15 board feet of a train leaves the station at 6:00pm traveling west at 80 mi/h. on a parallel track, a second train leaves the station 3 hours later traveling west at 100mi/h. at what time will the second train catch up with the first?