| 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) 1 km/h
C) 1.5 km/h
D) 2 km/h
Correct Answer: B
Solution :
| Let speed of the flow of water be v km/h and rate of sailing of sailor be u km/h, |
| Then, \[u+\text{v}=\frac{48}{8}\]\[\Rightarrow \]\[u+\text{v}=6\] .(i) |
| and \[u-\text{v}=\frac{48}{12}\]\[\Rightarrow \]\[u-\text{v}=4\] .(ii) |
| On solving Eqs. (i) and (ii), we get v = 1 km/h |
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