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Question
A driver of an auto rickshaw sees a lorry m ahead of him .After 30 seconds the lorry 90 m behind. If the speed of the auto rickshaw is 38 km /hr, then what is the speed of the lorry?
23 km/hr
25 km /hr
20 km /hr
18 km /hr
ANSWER : 3
Descrption
<pre> <math xmlns = "http://www.w3.org/1998/Math/MathML"><mi>R</mi><mi>e</mi><mi>l</mi><mi>a</mi><mi>t</mi><mi>i</mi><mi>v</mi><mi>e</mi><mo> </mo><mi>S</mi><mi>p</mi><mi>e</mi><mi>e</mi><mi>d</mi><mo> </mo><mspace linebreak = "newline"/><mo> = </mo><mfrac><mrow><mi>T</mi><mi>o</mi><mi>t</mi><mi>a</mi><mi>l</mi><mo> </mo><mi>d</mi><mi>i</mi><mi>s</mi><mi>tan</mi><mi>c</mi><mi>e</mi><mo> </mo></mrow><mrow><mi>T</mi><mi>o</mi><mi>t</mi><mi>a</mi><mi>l</mi><mo> </mo><mi>t</mi><mi>i</mi><mi>m</mi><mi>e</mi></mrow></mfrac><mspace linebreak = "newline"/><mo> = </mo><mfrac><mrow><mn>60</mn><mo> + </mo><mn>90</mn></mrow><mn>30</mn></mfrac><mspace linebreak = "newline"/><mo> = </mo><mfrac><mn>150</mn><mn>30</mn></mfrac><mspace linebreak = "newline"/><mo> = </mo><mn>5</mn><mi>m</mi><mo>/</mo><mi>s</mi><mspace linebreak = "newline"/><mo>.</mo><mo>'</mo><mo>.</mo><mo> </mo><mn>5</mn><mi>m</mi><mo>/</mo><mi>s</mi><mo> </mo><mspace linebreak = "newline"/><mo> = </mo><mn>5</mn><mo>×</mo><mfrac><mn>18</mn><mn>5</mn></mfrac><mspace linebreak = "newline"/><mo> = </mo><mn>18</mn><mo> </mo><mi>k</mi><mi>m</mi><mo>/</mo><mi>h</mi><mi>r</mi><mspace linebreak = "newline"/><mi>N</mi><mi>o</mi><mi>w</mi><mo>,</mo><mo> </mo><mi>r</mi><mi>e</mi><mi>l</mi><mi>a</mi><mi>t</mi><mi>i</mi><mi>v</mi><mi>e</mi><mo> </mo><mi>s</mi><mi>p</mi><mi>e</mi><mi>e</mi><mi>d</mi><mspace linebreak = "newline"/><mo> = </mo><mi>s</mi><mi>p</mi><mi>e</mi><mi>e</mi><mi>d</mi><mo> </mo><mi>o</mi><mi>f</mi><mo> </mo><mi>a</mi><mi>u</mi><mi>t</mi><mi>o</mi><mo> </mo><mi>r</mi><mi>i</mi><mi>c</mi><mi>k</mi><mi>s</mi><mi>h</mi><mi>a</mi><mi>w</mi><mo> </mo><mspace linebreak = "newline"/><mo> - </mo><mo> </mo><mi>s</mi><mi>p</mi><mi>e</mi><mi>e</mi><mi>d</mi><mo> </mo><mi>o</mi><mi>f</mi><mo> </mo><mi>l</mi><mi>o</mi><mi>r</mi><mi>r</mi><mi>y</mi><mo> </mo><mspace linebreak = "newline"/><mo>⇒</mo><mn>18</mn><mo> = </mo><mn>38</mn><mo> - </mo><mi>s</mi><mi>p</mi><mi>e</mi><mi>e</mi><mi>d</mi><mo> </mo><mi>o</mi><mi>f</mi><mo> </mo><mi>l</mi><mi>o</mi><mi>r</mi><mi>y</mi><mspace linebreak = "newline"/><mo>⇒</mo><mi>s</mi><mi>p</mi><mi>e</mi><mi>e</mi><mi>d</mi><mo> </mo><mi>o</mi><mi>f</mi><mo> </mo><mi>l</mi><mi>o</mi><mi>r</mi><mi>r</mi><mi>y</mi><mo> </mo><mspace linebreak = "newline"/><mo> = </mo><mn>38</mn><mo> - </mo><mn>18</mn><mspace linebreak = "newline"/><mo> = </mo><mn>20</mn><mo> </mo><mi>k</mi><mi>m</mi><mo>/</mo><mi>h</mi><mi>r</mi><mo> </mo></math> </pre>
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