If I walk at 4 km/h, I miss the bus by 10 min. If I walk at 5 km/h, I reach 5 min before the arrival of the bus. How far I walk to reach the bus stand?
Suppose the required distance be d km/h
Then, d/4-d/5=15min=1/4 h ⇒d 1/20=1/4⇒d=5km
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