A) 7 km
B) 6.25 km
C) 4 km
D) 6 km
Correct Answer: D
Solution :
[d] Let the distance be S km. Then, according to the question, \[\frac{S}{5}-\frac{S}{6}=\frac{7+5}{60}\]\[\Rightarrow \]\[S\left( \frac{6-5}{30} \right)=\frac{12}{60}\]\[\Rightarrow \]\[S\left( \frac{1}{30} \right)=\frac{1}{5}\] \[\therefore \] \[S=\frac{30}{5}=6\,\text{km}\] |
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