In a 100m, A beats B by 15m and B beats C by 10m. If A beats C by 5 sec then the speed of C.	Choose the most appropriate option.
A) 5m/sec
B) Speed of C can not be found with given data.
C) 4.7m/sec
D) 4m/sec
E) 4.5m/sec
When A finishes the race , B is at 85m....   and when B travels 100m, C is at 100-10= 
<gadget id="calculator">100-10</gadget>
<output>90</output>
90m.....   so C loses 10m on B's 100m................   or C will lose 1 m for every 10m of B.....   so C will lose 8.5 m when B travels 85m.....   From above we get correlation of all three..   A is at 100, B is at 85 and C is at  85-8.5= 
<gadget id="calculator"> 85-8.5</gadget>
<output>76.5</output>
76.5   So C is   100-76.5= 
<gadget id="calculator">  100-76.5</gadget>
<output>23.5</output>
23.5 m behind A...   and C also loses by 5 secs, this means C covers this 23.5m in 5 secs..   speed of 4.7m/sec=23.5/5=4.723.55=4.7 mps   ANSWER:4.7m/sec
<result>C</result>
In a 100m, A beats B by 15m and B beats C by 10m. If A beats C by 5 sec then the speed of C.