A. \frac{20d}{p}
B. \frac{20p}{d}
C. \frac{pd}{20}
D. \frac{20}{pd}
E. 20pd

Answer: B

Explanation:
Alan is traveling d km for 20 mins, hence rate is d/20,
Traveling at the same rate, he has to travel p miles,
Time taken= distance/speed = p/d/20
=20p/d

Answer choice: B

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