A) 68 km
B) 72 km
C) 70 km
D) 74km
E) 78km
Correct Answer: B
Solution :
Let the distance be x km. Then\[\frac{x}{40}+\frac{x}{6}=13+\frac{48}{60}=\frac{69}{5}\] \[\frac{23x}{120}=\frac{69}{5}\] \[\therefore x=\frac{120\times 69}{5\times 23}=72km\]You need to login to perform this action.
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