Q. Speed of a boat along and against the current are 12 km/hr and 8 km/hr respectively. Then the speed of the current in km/hr is :
Answer: 2
Notes: Speed of current $latex = \frac{1}{2}(Rate downstream - Rate Upstream)&s=1$ $latex = \frac{1}{2}(12-8) = 2 km/hr&s=1$ Hence option [A] is correct answer.

3