A distance of 600 km is to be covered using both Train and Bus. If first 120 km are covered by train

A distance of 600 km is to be covered using both Train and Bus. If first 120 km are covered by train and rest by bus, it takes 8hrs in all. However if the train is used for 80 km more it takes 20 minutes more for the entire journey. What is the speed of train? (a) 40 km/hr (b) 45 km/hr (c) 50 km/hr (d) 60 km/hr

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