The
speed of a boat in still water is 12 km/hr and the rate of current is 3 km/hr.
The distance travelled downstream in 30 minutes is
🎥 Video solution / Text Solution of this question is given below:
Speed in still water $= 12$ km/hr
Rate of current $= 3$ km/hr
Downstream speed $= 12 + 3 = 15$ km/hr
Time $= 30$ min $= \dfrac{1}{2}$ hr
Distance $= 15 \times \dfrac{1}{2} = 7.5$ km
Answer: $\boxed{7.5\text{ km}}$ ✅