Two goods trains each 2000 m long are running in opposite directions on parallel tracks. Their speeds are 45 km/hr and 30 km/hr respectively. Find the time taken by the slower train to pass the driver of the faster one?	Choose the most appropriate option:
A) 228
B) 278
C) 192
D) 27
E) 21
Relative speed = 45 + 30= 
<gadget id="calculator">45 + 30</gadget>
<output>75</output>
75 km/hr.   75 * 5/18= 125/6 m/sec.   Distance covered = 2000 + 2000= 
<gadget id="calculator">2000 + 2000</gadget>
<output>4_000</output>
4000 m.   Required time= 4000 * 6/125= 
<gadget id="calculator">4000 * 6/125</gadget>
<output>192</output>
192 sec.   Answer:192
<result>C</result>
Two goods trains each 2000 m long are running in opposite directions on parallel tracks. Their speeds are 45 km/hr and 30 km/hr respectively. Find the time taken by the slower train to pass the driver of the faster one?