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 speed is?

4:1
1.4
2:1
1:2

Correct Answer: 4:1

Explanation:

Let x km . be covered in y hrs.
then, 1st speed = (x / y) km/hr.
2nd speed = [(x/2) / 2y)] km/hr.
= (x/4y) km/hr.
∴ Ratio of speed = x/y : x/4y = 1 :1/4 = 4: 1

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