How many seconds does a train 130 meters long, traveling at 72 km/h, take to completely cross a bridge of 210 meters in length?  Choose the correct choice from the following choices: A) 13 B) 15 C) 17 D) 19 E) 21
72 km/h = 72000/3600= 
<gadget id="calculator">72000/3600</gadget>
<output>20</output>
20 m/s   Time= 340 / 20= 
<gadget id="calculator">340 / 20</gadget>
<output>17</output>
17 seconds   The answer is 17.
<result>C</result>
How many seconds does a train 130 meters long, traveling at 72 km/h, take to completely cross a bridge of 210 meters in length?