A train 120 m long is running with a speed of 66 km/hr. In what time will it pass a man who is roller skating at 12 km/hr in the direction opposite to that in which the train is going?  Pick.
A) 4.92
B) 6.92
C) 7.92
D) 4.92
E) 2.92
Speed of train relative to man = 66 + 12= 
<gadget id="calculator">66 + 12</gadget>
<output>78</output>
78 km/hr.= 78 * 5/18 = 65/3 m/sec.   Time taken to pass the man = 150 * 3/65   = 6.92 sec.   Answer: 6.92
<result>B</result>
A train 120 m long is running with a speed of 66 km/hr. In what time will it pass a man who is roller skating at 12 km/hr in the direction opposite to that in which the train is going?