A circular race track of length 100 m , 3 persons A,B,C start together .A and B start in same direction at speed of 10 and 8 m/s while C runs in opposite direction at speed of 15m/s when will all three meet for first time after start?

The distance should be multiple of 100 (where they all meet) since in each round they cover 100m each.
Since they have started at same point, so in each round they will cover 100,80 and 150 respectively.
When A covers 500m,B will cover 400 so they will meet but c will cover 750m so it will not meet with them.
but when A cover 1000m,b covers 800m and c cover 1500m. So all of them will meet at that time which is 10*10=100 sec.
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After 150 seconds they will meet first
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Plz tell me in detail mukesh nayal
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please explain it
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