Distance travelled by Ravi = (60 − 12) km = 48 kmand distance travelled by Ajay = (60 + 12) km = 72 kmDifference between the distance travelled by them = (72 − 48) km = 24 kmTime required by Ravi = 424​  hr=6  hr Speed of Ravi = 648​  km/hr=8  km/hr