Swati can row a boat on still water at a speed of 5 km/hr. However, on a given river, it takes her 1 hour more to row the boat 12 km upstream than downstream. One day, Swati rows the boat on this river from X to Y, which is N km upstream from X. Then she rows back to X immediately. If she takes at least 2 hours to complete this round trip, what is the minimum possible value of N?
Explanation:
Let the speed of the stream be x
Let the speed of the stream be
125-X = 125+X + 1
The value of x satisfying the above equation is 1 Now,
N5+1 + N5-1 ≥ 2
2N+3N12 ≥ 2
⇒ N ≥ 4.8
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