Walking at 4 Km/hr a man reaches his office 5 minutes late. If he walks at 5 Km/hr he will be \(\Large 2\frac{1}{2} \) minutes early. The distance of his office from his house is


A) 2.5 km

B) 2 km

C) 3 km

D) None of these

Correct Answer:
A) 2.5 km

Description for Correct answer:

\( \Large \frac{d}{4} - \frac{d}{5} = \frac{7\frac{1}{2}}{60} \)

\( \Large \frac{5d - 4d}{20} = \frac{15}{120} = \frac{1}8{}\)

\( \Large \frac{d}{20} = \frac{1}{8}\)

D = 2.5 km.


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