book Maths Puzzle Numerical Ability

a freight train averaging 45 mi/hr and an express train averaging 70 mi/hr leave the station at the same time. how long will it take the express train to overtake the frt. train by

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[ 25 divide (2 - 3)].2

the top 3 is right above the 2 how do we solve the intersection pt (x,y) of d following equations/lines

20x + 20y >= 250
15x + 25y >= 375
18x + 12y >= 200

these three lines will intersect at a point, wha