Two men start together to walk a certain distance, one at 4 kmph and another at 3 kmph.The former arrives half an hour before the latter. Find the distance.	Choose the correct choice from the following options:
A) 6 km B) 7 km C) 8 km D) 9 km E) None of these
Let the distance be x km. Then,   x/3 - x/4 =1/2   (4x - 3x)/12 = 1/2   x = 6 km   6 kmNSWER:6 km
<result>A</result>
Two men start together to walk a certain distance, one at 4 kmph and another at 3 kmph.The former arrives half an hour before the latter. Find the distance.