A certain distance is covered at a certain speed. If half

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A certain distance is covered at a certain speed. If half of this distance is covered in 4 times of the time, then find the ratio of the two speeds.?

1. 1 : 8
2. 1 : 4
3. 4 :1
4. 8 : 1

Correct Option: D

Let L km is covered in T h.
Then, first speed = L/T km/h
Again, L/2 km is covered in 4T h.
∴ New speed = (L/2 x 1/4T ) = (L/8T) km/ h
Ratio of speed = L/T : L/8T = 1 : 1/8 = 8 : 1