A) 30 km
B) 40 km
C) 70 km
D) 80 km
Correct Answer: C
Solution :
[c] If the total length of journey be x km, then \[\frac{x}{35}-\,\frac{x}{40}=\frac{15}{60}\] \[\Rightarrow \frac{8x-\,7x}{280}=\frac{1}{4}\] \[\Rightarrow \frac{x}{280}=\frac{1}{4}\] \[\Rightarrow x=\frac{1}{4}\times 280=70\,\,km\]You need to login to perform this action.
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