Two goods trains each 500 m long are running in opposite directions on parallel tracks. Their speeds are 70 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 options:
A) 22	B) 36	C) 48	D) 99	E) 12
Relative speed =70 + 30= 
<gadget id="calculator">70 + 30</gadget>
<output>100</output>
100 km/hr.   100 * 5/18= 250/9 m/sec.   Distance covered = 500 + 500= 
<gadget id="calculator">500 + 500</gadget>
<output>1_000</output>
1000 m.   Required time= 1000 * 9/250= 
<gadget id="calculator">1000 * 9/250</gadget>
<output>36</output>
36 sec.   Answer: 36
<result>B</result>
Two goods trains each 500 m long are running in opposite directions on parallel tracks. Their speeds are 70 km/hr and 30 km/hr respectively. Find the time taken by the slower train to pass the driver of the faster one?