| A boat goes 12 km in 1 h in still water. It takes thrice time in covering the same distance against the current. Find the speed of the current. |
A) 8 km/h
B) 12 km/h
C) 6 km/h
D) 7 km/h
Correct Answer: A
Solution :
| Speed of a boat in still water |
| \[=\frac{\text{Distance}}{\text{Time }}=\frac{12}{1}=12\,\,\text{km/h}\] |
| Speed against the current \[=\frac{12}{3}=4\,\,km/h\] |
| Let the speed of the current \[=x\,\,km/h\] |
| According to the question, |
| \[12-x=4\] |
| \[\Rightarrow \] \[x=8\,\,km/h\] |
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