A boat covers 35 km downstream in 2 hours and covers the same distance upstream in 7 hours. Find the speed (in km/h) of the boat in still water.

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**Solution:**

1. Calculate the downstream speed:
   - Distance = 35 km, Time = 2 h
   - $$S_{	ext{downstream}} = \frac{35}{2} = 17.5 	ext{ km/h}$$

2. Calculate the upstream speed:
   - Distance = 35 km, Time = 7 h
   - $$S_{	ext{upstream}} = \frac{35}{7} = 5 	ext{ km/h}$$

3. Calculate the speed of the boat in still water:
   - It is the average of downstream and upstream speeds
   - $$S_{	ext{still}} = \frac{17.5 + 5}{2} = \frac{22.5}{2} = 11.25 	ext{ km/h}$$

**Answer:** The speed of the boat in still water is **11.25 km/h**.

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