Two trains of equal length are running on parallel lines in the same direction at 46 km/hr and 36 km/hr. The faster train catches and completely passes the slower train in 18 seconds. What is the length of each train (in meters)?  Choose the most appropriate option
A) 20  B) 25  C) 35  D) 50  E) 65
The relative speed = 46 - 36= 
<gadget id="calculator">46 - 36</gadget>
<output>10</output>
10 km/hr= 10 * 5/18 = 25/9 m/s   In 18 seconds, the relative difference in distance traveled is  18 * 25/9= 
<gadget id="calculator"> 18 * 25/9</gadget>
<output>50</output>
50 meters   This distance is twice the length of each train.   The length of each train is  50/2= 
<gadget id="calculator"> 50/2</gadget>
<output>25</output>
25 meters   The answer is 25.
<result>B</result>
Two trains of equal length are running on parallel lines in the same direction at 46 km/hr and 36 km/hr. The faster train catches and completely passes the slower train in 18 seconds. What is the length of each train (in meters)?