Question : Find the speed of a boat in still water if the boat goes 12 km/hr along the stream and 4 km/hr against the stream.
Option 1: 10 km/hr
Option 2: 8 km/hr
Option 3: 7 km/hr
Option 4: 9 km/hr
Correct Answer: 8 km/hr
Solution :
Given:
Downstream speed = 12 km/hr
Upstream speed = 4 km/hr
Speed of boat in still water = $\frac{\text{Downstream speed + Upstream speed}}{2}$
Substituting the given values into the formula,
Speed of boat in still water = $\frac{12 + 4 }{2}$ = 8 km/hr
Hence, the correct answer is 8 km/hr.
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