A train crosses a post in 15 seconds and a platform 100 m long in 25 seconds. Its length is Choose the correct option
A) 150 m  B) 300 m  C) 400 m  D) 180 m  E) 160 m
Explanation:   150 mssume x is the length of the train and v is the speed   x/v = 15 =&gt; v = x/15   (x+100)/v = 25 =&gt; v = (x+100)/25   Ie, x/15 = (x+100)/25   =&gt; 5x = 3x+ 300   =&gt; x = 300/2= 
<gadget id="calculator">300/2</gadget>
<output>150</output>
150   150 mnswer: Option 150 m
<result>A</result>
A train crosses a post in 15 seconds and a platform 100 m long in 25 seconds. Its length is