A) 6 km/h
B) \[5\frac{1}{2}\]km/h
C) 4 km/h
D) 5 km/h
Correct Answer: D
Solution :
Let the speed of man = x fan/h \[\therefore \] \[30x-30\left( x-\frac{x}{15} \right)=10\] \[\Rightarrow \] \[30\left( x-x+\frac{x}{15} \right)=10\] \[\Rightarrow \] \[\frac{x}{15}=\frac{10}{30}\] \[\Rightarrow \] \[x=\frac{150}{30}=5\,\,\,km/h\]You need to login to perform this action.
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