A train travelled from A to B and back in a certain time at the rate of 60 Km/hr. But if the train had travelled from A to B at the rate of 80 Km/hr and back from B to A at the rate of 40 Km/hr it would take two hours longer. The distance between A and B is


A) 480 km

B) 320 km

C) 540 km

D) 180 km

Correct Answer:
A) 480 km

Description for Correct answer:

\( \Large \left(\frac{d}{80}+ \frac{d}{40} \right) - \left(\frac{d}{60}+ \frac{d}{60} \right) = 2 \)

\( \Large \frac{3d + 6d - 4d - 4d}{240} = 2 \)

D = 480 km


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