A train 280 m long is running at a speed of 54 km/hr. In what time will it pass a bridge 200 m long?
Choose the correct choice from the following answers.
A) 32 sec  B) 42 sec  C) 45 sec  D) 18 sec  E) 49 sec
total length= 280+200= 
<gadget id="calculator">280+200</gadget>
<output>480</output>
480   speed=54km/h=(54*5)/18= 
<gadget id="calculator">(54*5)/18</gadget>
<output>15</output>
15/1m/s   time=(480*1)/15= 
<gadget id="calculator">(480*1)/15</gadget>
<output>32</output>
32 sec.   32 secNSWER:32 sec
<result>A</result>
A train 280 m long is running at a speed of 54 km/hr. In what time will it pass a bridge 200 m long?