In a 100m race A beats B by 15m and B beats C by 10m.if A beats C by 5 sec then find the speed of?

or:In a 100m race A beats B by 15m and B beats C by 10m.if A beats C by 5 sec then find the speed of?

or:In a 100m race A beats B by 15m and B beats C by 10m.if A beats C by 5 sec then find the speed of?

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