- A3
- B4.5
- C4
- D2
Step-by-Step Solution
Twice the time means the downstream speed is twice the upstream speed: 9 + s = 2(9 - s), giving 3s = 9, so s = 3 km/h.
Answer: A) 3
A boat's speed in still water is 9 km/h. It takes twice as long to row a certain distance upstream as it does to row the same distance downstream. What is the speed of the stream 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
Two trains, 140 m and 160 m long, run on parallel tracks in opposite directions at 50…A train running at 72 km/h crosses a platform 250 m long in 20 seconds. What is the…A boat covers 20 km downstream in 2 hours and 12 km upstream in 2 hours. Find the speed…A boatman rows at 10 km/h in still water and the stream flows at 4 km/h. How long will…A man can row at 6 km/h in still water. He takes twice as long to row a certain distance…