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The ratio of speeds of two trains is 3 :...

The ratio of speeds of two trains is `3 : 4`. If the second train runs 300 km in 3 h, then what would be the speed of the first train?

(A) 100km/h

(B) 50 km/h

(C ) 70 km/h

(D) 75 km/h

A

C

B

D

C

A

D

B

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