How many seconds does a train 120 meters long, traveling at 54 km/h, take to completely cross a bridge of 180 meters in length?	Options
A) 18	B) 20	C) 22	D) 24	E) 26
54 km/h = 54000/3600= 
<gadget id="calculator">54000/3600</gadget>
<output>15</output>
15 m/s   Time= 300 / 15= 
<gadget id="calculator">300 / 15</gadget>
<output>20</output>
20 seconds   The answer is 20.
<result>B</result>
How many seconds does a train 120 meters long, traveling at 54 km/h, take to completely cross a bridge of 180 meters in length?