Question

43.
A certain distance is covered with a certain
speed. If half the distance is covered in double
time, then the ratio of this speed to original
speed is
(A) 1:4
(B) 4:1
(C) 2:1
(D) 1:2​

Answer 1

Answer:

Let x km be covered in y hours.

Then, speed =  

y

x

​  

 km/hr

In the second case,  

2

x

​  

 km is covered in 2y hours.

∴ New speed =(  

2

x

​  

×  

2y

1

​  

)km/hr=  

4y

x

​  

km/hr

∴ Ratio of speeds =  

y

x

​  

:  

4y

x

​  

=1:  

4

1

​  

=4:1.

pls mark brainiest