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A certain distance is covered at a certain speed. If half of this distance is covered in double the time, the ratio of the two speeds is

4 : 1
1 : 4
2 : 1
1 : 2

Correct Answer: 1 : 4

Explanation:

Case I Speed = Distance/ Time
Case II Speed = (Distance/2) / (2 x Time) = Distance / (4 x Time)
∴ Required ratio = 1/4 = 1:4

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