A) 2 km/h
B) 3 km/h
C) 5 km/h
D) Can't be determined
Correct Answer: A
Solution :
[a] Let the speed in return journey be x km/h. Then, \[6\,(x+1)=9x\] \[\Rightarrow \] \[3x=6\] \[\Rightarrow \] \[x=2\] Hence, the speed in return journey is 2 km/h. |
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