Question

A certain distance is covered at a certain speed. If half the distance is covered in
double the time, the ratio of two speeds is :
1) 4:1 2) 1 : 4
3) 2:1
4) 1:2 5) 3:2
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Answer 1

Answer:

(1) 4:1

this is the answer of your question

Answer 2

Answer:

A certain distance is covered at a certain speed (let time =y  and dist. = x)

Their Speed = dist. /time

First case= x/y

Second Case= (X/2)/(1/2Y)

                      =X/4Y

Two speed ratio= (x/y)/(X/4Y)

                          = 1/(1/4)

                          =4/1 =4:1