A train 110 m long is running with a speed of 90 km/h. In how many seconds will the train pass a man who is running at 9 km/h in the direction opposite to that in which the train is going?  Choose one:
A) 3 B) 4 C) 5 D) 6 E) 7
The speed of the train relative to the man = 90 + 9= 
<gadget id="calculator">90 + 9</gadget>
<output>99</output>
99 km/h.   99000 m/h * 1h/3600 s= (990/36) m/s   (110 m) / (990/36 m/s) = (110 * 36) / 990 = 36/9= 
<gadget id="calculator">36/9</gadget>
<output>4</output>
4 seconds   The answer is 4.
<result>B</result>
A train 110 m long is running with a speed of 90 km/h. In how many seconds will the train pass a man who is running at 9 km/h in the direction opposite to that in which the train is going?