Question: John and Alex start from the same point and walk in opposite directions. Alex walks at the rate of 6 km/hrand John walks at the

John and Alex start from the same point and walk in opposite directions. Alex walks at the rate of 6 km/hrand John walks at the rate of 8 km/hr.After how many hours will they be 168kilometers apart?Select one:a.12 hrsb.3.5 hrsc.21 hrsd.28 hrs

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