A) 36 km
B) 240 km
C) 8 km
D) Data inadequate
Correct Answer: C
Solution :
1st day = 4 km, 2nd day \[=4\times \frac{1}{2}=2\,\,km,\] 3rd day \[=2\times \frac{1}{2}=1\,\,km\] \[\therefore \]Total distance, \[S=4+2+1+\frac{1}{2}+\frac{1}{4}+...\] Which is infinite. GP with a = 4, \[r=\frac{1}{2}\] So, \[s=\frac{a}{1-r}=\frac{4}{1-\frac{1}{2}}=\frac{4}{\frac{1}{2}}=8\,\,km\]You need to login to perform this action.
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