A train 120 meter 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 the correct choice
A) 10m/s	B) 20m/s	C) 30m/s	D) 40m/s	E) 50m/s
speed of 1st train=120/12= 
<gadget id="calculator">120/12</gadget>
<output>10</output>
10m/s   let the speed of 2nd is v   then   240/(v+10)=8   8v=160   v=20m/s   ANSWER:20m/s
<result>B</result>
A train 120 meter 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