| A certain distance is covered at a certain speed. If half of this distance is covered in double the time, then what is the ratio of the two speeds? |
A) 4 : 1
B) 1 : 4
C) 1 : 2
D) 2 : 1
Correct Answer: A
Solution :
| Let \[x\,\,km\]be covered in \[y\,\,h.\] |
| First speed \[=\frac{x}{y}km/h\] |
| New speed \[=\frac{\frac{x}{2}}{2y}=\frac{x}{4y}\] |
| \[\therefore \] Ratio \[=\frac{x/y}{x/4y}=4:1\] |
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