Two goods train each 500 m long are running in opposite directions so parallel tracks.Their speeds are 45 kmph and 30 kmph respectively.Find the time taken by the slower train to pass the driver of the first one  Choose the correct choice from the following options
A) 12 sec  B) 24 sec  C) 48 sec  D) 60 sec  E) 65 sec
only need length of slower train which is L=500m   relative sped (both are opposite direction)   s=45+30= 
<gadget id="calculator">45+30</gadget>
<output>75</output>
75kmph   75*5/18=125/6 m/s   time =dist/speed   =(500*6)/125= 
<gadget id="calculator">(500*6)/125</gadget>
<output>24</output>
24 sec   ANSWER:24 sec
<result>B</result>
Two goods train each 500 m long are running in opposite directions so parallel tracks.Their speeds are 45 kmph and 30 kmph respectively.Find the time taken by the slower train to pass the driver of the first one