A train 120 meters long passes an electric pole in 12 seconds and another train of same length traveling in opposite direction in 8 seconds. The speed of the second train is	Choose one:
A) 60 Km B) 66 Km C) 72 Km D) 62 Km E) 70 Km
speed of first train=120/12= 
<gadget id="calculator">120/12</gadget>
<output>10</output>
10 m/s   let speed of second train be x m/s. As they are approaching each other, relative speed is (10+x) m/s.   distance between each other is  120+120= 
<gadget id="calculator"> 120+120</gadget>
<output>240</output>
240 m.   time of crossing each other is 8 sec=&gt;240/(10+x)=8   =&gt;x=20m/s = 20*18/5 km/hr = 72 kmph   ANSWER:72 Km
<result>C</result>
A train 120 meters long passes an electric pole in 12 seconds and another train of same length traveling in opposite direction in 8 seconds. The speed of the second train is