Two goods trains each 750 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 option: A) 72 B) 45 C) 48 D) 51 E) 44
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 = 750 + 750= 
<gadget id="calculator">750 + 750</gadget>
<output>1_500</output>
1500 m.   Required time= 1500 * 6/125= 
<gadget id="calculator">1500 * 6/125</gadget>
<output>72</output>
72 sec.   72nswer: Option 72
<result>A</result>
Two goods trains each 750 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?