- A9
- B4
- C8
- D10
Step-by-Step Solution
Downstream speed = 52/4 = 13 km/h; upstream speed = 30/6 = 5 km/h. Still-water speed = (13 + 5)/2 = 9 km/h.
Answer: A) 9
A country boat goes 52 km downstream in 4 hours and 30 km upstream in 6 hours. What is its speed in still water (in km/h)?
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
A man rows at 6 km/h in still water. He takes twice as long to row upstream as to row…A goods train 324 m long moves at 81 km/h. In how many seconds does it pass a signal post?Rohit rides his scooter from Pune to Lonavala at 42 km/h and comes back by the same road…How many seconds does a 225 m long train running at 81 km/h take to cross a platform…On parallel tracks, a 150 m train at 45 km/h and a 210 m train at 63 km/h approach each…