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

Let x km distance be covered in y h.

So, speed in first case = \( \Large \frac{x}{y}Km/hr\)

And speed in second case = \( \Large \frac{x/2}{2y} = \frac{x}{4y}Km/hr\)

Required ratio = \( \Large \frac{x}{y}:\frac{x}{4y} = 1 : \frac{1}{4}\)

= 4 : 1