A person can row at 9kmph and still water. He takes 4 ½ hours to row from A to B and back . what is the distance between A and B if the speed of the stream is 1 kmph?
32 km
25 km
28 m
None of these
Explanation:
Let the distance between A and B be x km.
Total time = x/(9 + 1) + x/(9 - 1) = 4.5
=> x/10 + x/8 = 9/2 => (4x + 5x)/40 = 9/2 => x = 20 km.
Let the distance between A and B be x km.
Total time = x/(9 + 1) + x/(9 - 1) = 4.5
=> x/10 + x/8 = 9/2 => (4x + 5x)/40 = 9/2 => x = 20 km.