| A sailor sails a distance of 48 km along the flow of a river in 8 h. If it takes 12 h to return the same distance, then the speed of the flow of the river is |
A) 0.5 km/h
B) 5 km/h
C) 1.5 km/h
D) 2 km/h
Correct Answer: B
Solution :
| Let speed of the flow of river be \[x\,\,km/h\] and rate of sailing of sailer be \[y\,\,km/h.\] |
| Downstream speed \[(x+y)=\frac{48}{8}\] |
| \[\Rightarrow \] \[(x+y)=6\] (i) |
| and upstream speed \[(x-y)=\frac{48}{12}\] |
| \[\Rightarrow \] \[x-y=4\] ... (ii) |
| On solving Eqs. (i) and (il), we get |
| \[x=5\,\,km/h\] |
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