If I walk at 4 km/h, I miss the bus by 10 minutes. If I walk at 5 km/h, I reach 5 minutes before the arrival of the bus. How far I walk to reach the bus stand ?  Pick.
A) 5 km
B) 4.5 km
C) 5 1 ⁄ 4 km / h
D) can not be determined
E) none of these

Rationale: "d = product of speed difference of time / difference of speed d = 4 × 5 / 60 [ 10 − ( − 5 ) / 5 − 4 ] [ here , – ve sign indicates before the schedule time ] ⇒ d = 5 km answer a"
Answer: A