A) 6km
B) 14 km
C) 10 km
D) 4 km
E) 8 km
Correct Answer: A
Solution :
Rate upstream \[=12-3\text{ }=\text{ }9\]kmph Rate downstream =12+3 = 15 kmph If the distance .between A and B be x km. then \[\frac{x}{9}+\frac{x}{15}=1+\frac{4}{60}=1+\frac{1}{15}\] \[\Rightarrow \frac{5x+3x}{45}=\frac{16}{15}\Rightarrow 8x=16\times 3\] \[\Rightarrow x=\frac{16\times 3}{8}=6\,\,km.\]You need to login to perform this action.
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