book Maths Puzzle Numerical Ability

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

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book Other Question

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 If Sally can paint a house in 4 hours and John can paint the house in 6 hours. How long will it take them to paint the house together?