Question

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 : ??

Answer 1

Let x km distance be covered in y h.

So, speed in first case =
x/y Km/hr

And speed in second case =
(x/2)/2y = x/4y Km/hr

Required ratio =
x/y : x/4y

=1 : 1/4

= 4 : 1