| Nilu covers a distance by walking for 6 h. While returning, his speed decreases by 2 km/h and he takes 9 h to cover the same distance. What was her speed while returning? |
A) 2 km/h
B) 5 km/h
C) 4 km/h
D) 7 km/h
Correct Answer: C
Solution :
| Let the speed in return journey \[=x\] |
| According to the question, |
| \[6\,\,(x+2)=9x\] |
| \[\Rightarrow \] \[6x+12=9x\] |
| \[\Rightarrow \] \[9x-6x=12\]\[\Rightarrow \]\[3x=12\] |
| \[\therefore \] \[x=\frac{12}{3}=4\,\,km/h\] |
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