The ratio between the speeds of two trains is 3 : 4. The second train runs 800 km in 5 hrs, and speed of first train is:
Speed of second train = $$\frac{800}{5}=160$$ km/hr
Ratio of speeds of first train to second train = 3Â : 4
=> Speed of first train = $$\frac{3}{4}\times160=120$$ km/hr
=> Ans - (A)
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