A) 210 km
B) 400 km
C) 420 km
D) 500 km
Correct Answer: C
Solution :
Let total distance of the journey be x km. Then, first part of journey\[=\frac{x}{2}\text{km}\] and second part of journey\[=\frac{x}{2}\text{km}\] By given condition, \[\frac{\frac{x}{2}}{30}+\frac{\frac{x}{2}}{70}=10\] \[\Rightarrow \] \[\frac{7x+3x}{210}=20\] \[\Rightarrow \] \[x=2\times 210=420\,km\]You need to login to perform this action.
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