P beats Q by 125 meter in a kilometer race. Find Q's speed if P's speed is 8 meter/sec.
Choices.
A) 12.25 meter/sec
B) 7 meter/sec
C) 14 meter/sec
D) 18 meter/sec
E) 28 meter/sec
P's speed = 8 m/s   P's distance = 1000 m (as it is a km race)   t = 1000/8= 
<gadget id="calculator">1000/8</gadget>
<output>125</output>
125 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 = 875/125= 
<gadget id="calculator">875/125</gadget>
<output>7</output>
7 m/s   Hence 7 meter/sec is the answer.
<result>B</result>
P beats Q by 125 meter in a kilometer race. Find Q's speed if P's speed is 8 meter/sec.