- A5
- B6
- C10
- D7.5
Step-by-Step Solution
Downstream speed = 20/2 = 10 km/h, upstream speed = 20/4 = 5 km/h. Boat speed = (10 + 5)/2 = 7.5 km/h.
Answer: D) 7.5
A boat goes 20 km downstream in 2 hours and returns the same distance upstream in 4 hours. Find the speed of the boat in still water in km/h.
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