P beats Q by 250 meter in a kilometer race. Find Q's speed if P's speed is 16 meter/sec.  Choose the correct choice from the following answers.
A) 21 meter/sec B) 7 meter/sec C) 12 meter/sec D) 18 meter/sec E) 28 meter/sec
P's speed = 16m/s   P's distance = 1000m (as it is a km race)   t = 1000/16= 
<gadget id="calculator">1000/16</gadget>
<output>125/2 = around 62.5</output>
62.5 sec   Q's distance= 1000-250= 
<gadget id="calculator">1000-250</gadget>
<output>750</output>
750m   Q's time to complete this distance is also 62.5 sec.   Q's speed= dist/time = 750/62.5= 
<gadget id="calculator">750/62.5</gadget>
<output>12</output>
12 m/s   Hence 12 meter/sec is the answer.
<result>C</result>
P beats Q by 250 meter in a kilometer race. Find Q's speed if P's speed is 16 meter/sec.