P beats Q by 125 meter in a kilometer race. Find Q's speed if P's speed is 24 meter/sec.  Options:
A) 21 meter/sec  B) 7 meter/sec  C) 14 meter/sec  D) 18 meter/sec  E) 28 meter/sec
P's speed = 24 m/s   P's distance = 1000m (as it is a km race)   t = 1000/24 = 41.7 sec   Q's distance = 1000-125= 
<gadget id="calculator">1000-125</gadget>
<output>875</output>
875m   Q's time to complete this distance is also 62.5 sec.   Q's speed= dist/time = 875/41.7 = 21 m/s   Hence 21 meter/sec is the answer.
<result>A</result>
P beats Q by 125 meter in a kilometer race. Find Q's speed if P's speed is 24 meter/sec.