- A9
- B3
- C6
- D12
Step-by-Step Solution
Downstream speed = 30/2.5 = 12 km/h; upstream = 30/5 = 6 km/h. Still-water speed = (12 + 6)/2 = 9 km/h.
Answer: A) 9
A boat goes 30 km downstream in 2.5 hours and returns the same 30 km upstream in 5 hours. Find the boat's 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
Shreya rows at 9 km/h in still water, and the river current is 3 km/h. A trip to a ghat…Nagpur and Raipur are 315 km apart by rail. A goods train leaves Nagpur for Raipur at 45…Lata drives her car from Satara to Kolhapur through heavy traffic at 33 km/h and returns…A boat covers 30 km downstream in 2 hours and 20 km upstream in 4 hours. Find the speed…Sanjay rows at 10 km/h in still water, and the river flows at 4 km/h. Rowing to a temple…