In what time will two trains cross each other completely, which are running on the same parallel lines in opposite directions, each train running with a speed of 90 kmph being 160 m and 140 m in length respectively? Answers:
A) 5.6 sec  B) 6.2 sec  C) 6.0 sec  D) 7.2 sec  E) 6.8 sec
D = 160m + 140m = 300m * 1/1000 160  + 140= 
<gadget id="calculator">160  + 140</gadget>
<output>300</output>
300m * 1/1000 = 0.3 kms   RS 300  * 1/1000= 
<gadget id="calculator">300  * 1/1000</gadget>
<output>3/10 = around 0.3</output>
0.3 kms   RS= 90 + 90= 
<gadget id="calculator">90 + 90</gadget>
<output>180</output>
180 kmph   T= (0.3/180) * 3600= 
<gadget id="calculator">(0.3/180) * 3600</gadget>
<output>6</output>
6.0 sec   ANSWER:6.0 sec
<result>C</result>
In what time will two trains cross each other completely, which are running on the same parallel lines in opposite directions, each train running with a speed of 90 kmph being 160 m and 140 m in length respectively?