Two trains each 180 m in length are running on the same parallel lines in opposite directions with the speed of each 80 kmph. In what time will they cross each other completely?	Choose the most appropriate option:
A) 7.8 sec
B) 8.1 sec
C) 8.3 sec
D) 8.2 sec
E) 8.4 sec
D = 180m + 180m = 360m * 1/1000 180  + 180= 
<gadget id="calculator">180  + 180</gadget>
<output>360</output>
360m * 1/1000 = 0.36 kms   RS 360  * 1/1000= 
<gadget id="calculator">360  * 1/1000</gadget>
<output>9/25 = around 0.36</output>
0.36 kms   RS= 80 + 80= 
<gadget id="calculator">80 + 80</gadget>
<output>160</output>
160 kmph   T= (0.36/160) * 3600= 
<gadget id="calculator">(0.36/160) * 3600</gadget>
<output>8.1</output>
8.1 sec   ANSWER:8.1 sec
<result>B</result>
Two trains each 180 m in length are running on the same parallel lines in opposite directions with the speed of each 80 kmph. In what time will they cross each other completely?