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

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

Correct Answer: 4 : 1

Explanation:

Let L km distance be covered in T h. So, speed in first case = L/T km/h.
And speed in second case = (L/2)/2T = L/4T km/h
∴ Required ratio = L/T : L/4T =1 : 1/4 = 4 : 1

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