The ratio between the speeds of two trains is 7 : 8. If the second train runs 200 km in 1 hours, then the speed of the first train is:
Explanation:
Let the speed of two trains be 7x and 8x km/hr.
Then, 8x =200/1= 200
∴ x =200/8 = 25
⇒ Speed of first train = (7 × 25) km/hr = 175 km/hr.
Hence, option (d).
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