A train 320 m in length crosses a telegraph post in 16 seconds. The speed of the train is?  Pick.
A) 22 kmph  B) 77 kmph  C) 54 kmph  D) 72 kmph  E) 88 kmph
S = 320/16 * 18/5= 
<gadget id="calculator">320/16 * 18/5</gadget>
<output>72</output>
72 kmph   Answer:72 kmph
<result>D</result>
A train 320 m in length crosses a telegraph post in 16 seconds. The speed of the train is?