Two goods trains each 500 m long are running in opposite directions on parallel tracks. Their speeds are 30 km/hr and 90 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 options:
A) 48
B) 30
C) 26
D) 23
E) 12
Relative speed = 90 + 30= 
<gadget id="calculator">90 + 30</gadget>
<output>120</output>
120 km/hr.   120 * 5/18= 100/3 m/sec.   Distance covered = 500 + 500= 
<gadget id="calculator">500 + 500</gadget>
<output>1_000</output>
1000 m.   Required time= 1000 * 3/100= 
<gadget id="calculator">1000 * 3/100</gadget>
<output>30</output>
30 sec.   Answer:30
<result>B</result>
Two goods trains each 500 m long are running in opposite directions on parallel tracks. Their speeds are 30 km/hr and 90 km/hr respectively. Find the time taken by the slower train to pass the driver of the faster one?