| A boat while travelling upstream covers a distance of 18 km at the speed of 3 km/h, whereas while travelling downstream it covers the same distance at a speed of 9 km/h. What is the speed of the boat in still water? |
A) 3 km/h
B) 5 km/h
C) 7 km/h
D) Cannot be determined
E) None of the above
Correct Answer: E
Solution :
| Speed of the boat in upstream \[=\frac{18}{3}=6\,km/h\] |
| Speed of the boat in downstream \[=\frac{18}{9}=2\,km/h\] |
| Then, speed of boat in still water |
| \[=\frac{6+2}{2}=\frac{8}{2}=4\,km/h\] |
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