| A boat running downstream covers a distance of 12 km in 2 h while for covering the same distance upstream it takes 3 h. What is the speed of the boat in still water? |
A) 8 km/h
B) 4 km/h
C) 5 km/h
D) 9 km/h
Correct Answer: C
Solution :
| Downstream speed \[=\left( \frac{12}{2} \right)km/h=6km/h\] |
| Upstream speed \[=\left( \frac{12}{3} \right)km/h=4km/h\] |
| \[\therefore \]Speed in still water \[=\frac{1}{2}(6+4)=5km/h\] |
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