Two goods trains each 500 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 correct choice from the following answers.
A) 22	B) 66	C) 48	D) 77	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 = 500 + 500= 
<gadget id="calculator">500 + 500</gadget>
<output>1_000</output>
1000 m.   Required time= 1000 * 6/125= 
<gadget id="calculator">1000 * 6/125</gadget>
<output>48</output>
48 sec.   Answer:48
<result>C</result>
Two goods trains each 500 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?