- A10.5 km/h
- B9 km/h
- C12 km/h
- D10 km/h
Step-by-Step Solution
Downstream speed = 30/2 = 15 km/h; upstream = 18/3 = 6 km/h. Still water = (15 + 6)/2 = 10.5 km/h.
Answer: A) 10.5 km/h
A boat covers 30 km downstream in 2 hours and 18 km upstream in 3 hours. What is the speed of the boat in still water?
Competition practiceSpeed, Time & Distance
Master this topic in 30 minutes a day.
Don't just memorise the answer — build a daily practice habit.
Practice 5 Similar Questions Free →All Speed, Time & Distance practice questions
More Speed, Time & Distance practice
On the Brahmaputra, a ferry covers 40 km downstream in 2.5 hours and the same 40 km…A train 180 m long is running at 54 km/h. How long will it take to cross a platform 270…A boat goes 20 km downstream in 2 hours and 12 km upstream in 3 hours. What is the speed…A train 150 m long crosses a platform 350 m long in 20 seconds. What is the speed of the…A man can row at 6 km/h in still water. If it takes him twice as long to row a certain…