The ratio of the speeds of two trains is...

The ratio of the speeds of two trains is 3:4. If the second train runs 300 km in 3 hours, then what would be the speed of the first train ?
A. 100 km/hr
B. 50 km/hr
C. 70 km/hr
D. 75 km/hr

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The ratio of the speeds of two trains is 3:4. If the second train runs 300 km in 3 hours, then what would be the speed of the first train ?
A. 100 km/hr
B. 50 km/hr
C. 70 km/hr
D. 75 km/hr