- A1.8 km/h
- B2.4 km/h
- C1.2 km/h
- D5 km/h
Step-by-Step Solution
Crossing time = 0.4 ÷ 3 h = 8 min. In that time the current carries her 0.24 km, so its speed = 0.24 ÷ (2/15) = 1.8 km/h.
Answer: A) 1.8 km/h
A river is 400 m wide. A swimmer swims at 3 km/h relative to the water, pointed straight across, and lands 240 m downstream of the point directly opposite. What is the speed of the current?
Competition practiceBoats & Streams
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 Boats & Streams practice questions
More Boats & Streams practice
Mukesh can row three-quarters of a kilometre against the stream in 11¼ minutes and…Launch B (15 km/h in still water) leaves a jetty going downstream. One hour later launch…In the morning the river flows at 2 km/h; by evening it flows at 4 km/h. A boat (12 km/h…The current is one-fifth of a boat's speed in still water. A 36 km out-and-back trip (36…A boat's upstream speed is 25% less than its downstream speed. Over 30 km it needs 1…