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A train running at 36 kmph passes another train completely in 12 sec , which is half of its length , running in the opposite direction at 54 kmph. Kf it also passes a railway platform in 1.5 m , what is the length of the platform (in meters)?

A train running at 36 kmph passes another train completely in 12 sec , which is half of its length , running in the opposite direction at 54 kmph. Kf it also passes a railway platform in 1.5 m , what is the length of the platform (in meters)? Correct Answer 700

When a train crosses a platform or a train, it passes its own lwngth + the platform Or trains kength. Now (36 + 54) = 90km/h = <math xmlns = "http://www.w3.org/1998/Math/MathML"><mfrac><mn>90</mn><mrow><mn>3</mn><mo>.</mo><mn>6</mn></mrow></mfrac><mi>m</mi><mo>/</mo><mi>s</mi><mo> = </mo><mn>25</mn><mi>m</mi><mo>/</mo><mi>s</mi><mo>;</mo><mo>&#xA0;</mo><mn>25</mn><mi>m</mi><mo>/</mo><mi>s</mi><mo>&#xD7;</mo><mn>12</mn><mi>m</mi><mo>/</mo><mi>s</mi><mo> = </mo><mo>&#xA0;</mo><mn>300</mn><mi>m</mi><mi>e</mi><mi>t</mi><mi>e</mi><mi>r</mi><mspace linebreak = "newline"/><mi>s</mi><mi>o</mi><mo>&#xA0;</mo><mi>t</mi><mi>r</mi><mi>a</mi><mi>i</mi><mi>n</mi><mi>s</mi><mo>&#xA0;</mo><mi>l</mi><mi>e</mi><mi>n</mi><mi>g</mi><mi>t</mi><mi>h</mi><mo>&#xA0;</mo><mo> = </mo><mfrac><mrow><mn>300</mn><mo>&#xD7;</mo><mn>2</mn></mrow><mn>3</mn></mfrac><mo>&#xA0;</mo><mo> = </mo><mo>&#xA0;</mo><mn>200</mn><mo>&#xA0;</mo><mi>m</mi><mi>e</mi><mi>t</mi><mi>e</mi><mi>r</mi><mspace linebreak = "newline"/><mi>n</mi><mi>o</mi><mi>w</mi><mo>,</mo><mfrac><mrow><mn>200</mn><mo> + </mo><mi>p</mi><mi>l</mi><mi>a</mi><mi>t</mi><mi>f</mi><mi>o</mi><mi>r</mi><mi>m</mi><mi>s</mi><mo>&#xA0;</mo><mi>l</mi><mi>e</mi><mi>n</mi><mi>g</mi><mi>t</mi><mi>h</mi></mrow><mrow><mn>1</mn><mo>.</mo><mn>5</mn><mo>&#xD7;</mo><mn>60</mn></mrow></mfrac><mo>&#xA0;</mo><mo> = </mo><mfrac><mn>36</mn><mrow><mn>3</mn><mo>.</mo><mn>6</mn></mrow></mfrac><mspace linebreak = "newline"/><mi>O</mi><mi>r</mi><mo>,</mo><mo>&#xA0;</mo><mi>p</mi><mi>l</mi><mi>a</mi><mi>t</mi><mi>f</mi><mi>o</mi><mi>r</mi><mi>m</mi><mo>&#xA0;</mo><mi>l</mi><mi>e</mi><mi>n</mi><mi>g</mi><mi>t</mi><mi>h</mi><mo>&#xA0;</mo><mo> = </mo><mo>&#xA0;</mo><mn>900</mn><mo> - </mo><mn>200</mn><mo> = </mo><mn>700</mn><mo>&#xA0;</mo><mi>m</mi><mi>e</mi><mi>t</mi><mi>e</mi><mi>r</mi><mo>.</mo></math>

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