A man can row at 5 kmph in still water. If the velocity of current is 1 kmph and it takes him 1 hour to row to a place and come back, how far is the place?
a) 2.4 km
b) 2.5 km
c) 3 km
d) 3.6 km
Correct option: a) 2.4 km
Explanation:
Speed downstream=(5+1) kmph= 6 kmph; speed upstream=(5-1) kmph= 4 kmph let the required distance be x.
Then (x/6)+(x/4)=1 or 2x+3x=12 or 5x=12 or x=2.4 km
