A train 110 m long is running with a speed of 60 km/hr. In what time will it pass a trolley that is running with a speed of 12 km/hr in the direction opposite to that in which the train is going?
Choose the correct choice from the following answers.
A) 4.31 B) 6.75 C) 7.92 D) 5.5 E) 6.5
Speed of train relative to trolley = 60 + 12= 
<gadget id="calculator">60 + 12</gadget>
<output>72</output>
72 km/hr.= 72 * 5/18= 
<gadget id="calculator">72 * 5/18</gadget>
<output>20</output>
20 m/sec.   Time taken to pass the trolley= 110 * 1/20= 
<gadget id="calculator">110 * 1/20</gadget>
<output>11/2 = around 5.5</output>
5.5 sec.   Answer: 5.5
<result>D</result>
A train 110 m long is running with a speed of 60 km/hr. In what time will it pass a trolley that is running with a speed of 12 km/hr in the direction opposite to that in which the train is going?