Two trains each 210m in length each, are running on two parallel lines in opposite directions. If one goes at the speed of 90km/h while the other travels at 85km/h. how long will it take for them to pass each other completely.
Choose the correct answer
A) 3 sec B) 2.6 sec C) 3.6 sec D) 8.6 sec E) 7.6 sec
Explanation:   8.6 sec = 210 m +210 m = 420 m   RS = 90 + 85= 
<gadget id="calculator">90 + 85</gadget>
<output>175</output>
175 * 5/18= 243/5   T = 420 * 5/243 = 8.6 sec   Answer: Option 8.6 sec
<result>D</result>
Two trains each 210m in length each, are running on two parallel lines in opposite directions. If one goes at the speed of 90km/h while the other travels at 85km/h. how long will it take for them to pass each other completely.