Two trains of lengths 150m and 180m respectively are running in opposite directions with a speed of 30 km/hr and 24 km/hr respectively. How much time will they take to cross each ther?	Choose the correct choice from the following choices: A) 21 secs. B) 23 secs. C) 24 secs. D) 22 secs. E) 28 secs.
Relative speed = (30+24) km/hr =15m/s. Time taken by the trains to cross each other =sum of lengths of two trains /Relative speed. (150+180)/15sec. =330/15= 
<gadget id="calculator">330/15</gadget>
<output>22</output>
sec22s. Answer : 22 secs.
<result>D</result>
Two trains of lengths 150m and 180m respectively are running in opposite directions with a speed of 30 km/hr and 24 km/hr respectively. How much time will they take to cross each ther?