A) 5 km
B) 4 km
C) 6 km
D) 4.5 km
Correct Answer: B
Solution :
[b] Let the distance of the school of the boy from his house be d km. Then, \[\frac{x}{3}-\frac{x}{4}=\frac{20}{60}\] \[\Rightarrow \] \[\frac{x}{12}=\frac{1}{3}\] \[\Rightarrow \] \[x=4\,km\] |
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