A) 12 km
B) 16 km
C) 20 km
D) 24 km
Correct Answer: B
Solution :
Let man walked for t h. \[\therefore \] \[t\times 4+(9-t)\times 9=61\] \[\Rightarrow \]\[4\,t+81-9\,t=61\] \[\Rightarrow \]\[81-5\,t=61\] \[\Rightarrow \]\[5\,t=20\] \[\Rightarrow \]\[t=40\] \[\therefore \] Distance travelled on foot \[=4\times 4=16\,\,\text{km}\]You need to login to perform this action.
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