Discussion
A man can walk a certain distance at a uniform speed in 100 days. How long will it take him to cover twice the distance at half the normal speed?
Answer: E
Time is proportional to distance and inversely proportional to speed.
\[ t' = 100 \times 2 \times \frac{1}{1/2} = 100 \times 2 \times 2 \]
\[ = 400 \text{ days} \]
Doubling the distance doubles the time, and halving the speed doubles it again - the two effects compound.
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