In a circular racetrack of length 100 m, three persons A, B and C start together. A and B start in the same direction at speeds of 10 m/s and 8 m/s respectively. While C runs in the opposite direction at 15 m/s. When will all the three meet for the first time on the track after the start?	Choose the correct choice
A) After 4 s B) After 50 s C) After 100 s D) After 200 s E) None of these
A takes (100m) / (10m/s) = 10s to finish one complete round.   B takes (100m) / (8m/s) = 12.5s to finish one complete round.   C takes (100m) / (15m/s) = (20/3)s to finish one complete round.   For them to meet, the time will be LAfter 100 sM of above three times i.e,   LAfter 100 sM(10,12.5,20/3) = LAfter 100 sM(10,25,20)/GAfter 100 sD(1,2,3)=100/1= 
<gadget id="calculator">100/1</gadget>
<output>100</output>
100sec   ANSWER:After 100 s
<result>C</result>
In a circular racetrack of length 100 m, three persons A, B and C start together. A and B start in the same direction at speeds of 10 m/s and 8 m/s respectively. While C runs in the opposite direction at 15 m/s. When will all the three meet for the first time on the track after the start?