If a man walks at the rate of 4 kmph, he misses a train by only 6 min. However, if he walks at the rate of 5 kmph he reaches the station 6 minutes before the arrival of the train. The distance covered by him to reach the station is	Choose the correct choice from the following options.
A) 3 km B) 4 km C) 5 km D) 6 km E) 7 km
Let the distance covered be d and time taken to reach the station in time t   d/4 = t+6/60---(1)   d/5 = t-6/60---(2)   (1)-(2) gives   d/4 - d/5 = (6+6)/60   d/20 = 12/60   d = 12*20/60= 
<gadget id="calculator">12*20/60</gadget>
<output>4</output>
4 km   ANSWER:4 km
<result>B</result>
If a man walks at the rate of 4 kmph, he misses a train by only 6 min. However, if he walks at the rate of 5 kmph he reaches the station 6 minutes before the arrival of the train. The distance covered by him to reach the station is