a) 2.4 km
b) 2.5 km
c) 3 km
d) 3.6 km
Answer: a
Explanation: Speed downstream = (5 + 1) kmph = 6 kmph
Speed upstream = (5 – 1) kmph = 4 kmph
Let the required distance be x km
$$\frac{x}{6} + \frac{x}{4}$$ = 1
2x + 3x = 12
5x = 12
x = 2.4 km
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