book Maths Puzzle Numerical Ability

a radio tower casts a shadow 120 meters long when the angle of elevation of the sun is 41 (degrees. how tall is the tower?

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a passenger train travels at 60mi/h and a freight train travels at 40mi/h. It takes the passenger train 1.5h less time to cover the same distance as the freight train. How long d I need to graph 4x - 7y = 12. I tried to re-write in in intercept slope form but I get y = 4/7x - 12/7 which does not seem right because I cannot plot on graph paper a y-intercept