Bunuel wrote:
Bob can cover x kilometers at 25 kilometers per hour in an hour less time that at 20 kilometers per hour. What is the value of x?
A. 125 km
B. 120 km
C. 100 km
D. 90 km
E. 80km
Solution:
- •Distance = xkm
- oTime taken when speed is 25 kmph =\(\frac{x}{25}\) hr
oTime taken when speed is 20 kmph =\(\frac{x}{20}\)
- \(\frac{x}{20} –\frac{ x}{25} =1\)
\( 5x – 4x=100\)
\( x=100\) km
Hence, the correct answer is OptionC.
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