- A7.5 km/h
- B5 km/h
- C6 km/h
- D9 km/h
Step-by-Step Solution
(b − s)/(b + s) = 2/3 ⇒ b = 5s. (b − s − 1)/(b + s + 1) = 1/2 ⇒ b = 3s + 3. So 5s = 3s + 3 ⇒ s = 1.5, b = 7.5 km/h.
Answer: A) 7.5 km/h
A boat's upstream and downstream speeds are in the ratio 2 : 3. If the current were 1 km/h faster, the ratio would become 1 : 2. What is the boat's speed in still water?
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
The current is 2 km/h. A boat goes 48 km downstream and returns in 10 hours. How long…Two launches with the same still-water speed set off at the same moment from opposite…A speedboat (18 km/h in still water) leaves ghat A at 9 a.m. for ghat B, 45 km upstream;…For a certain swimmer, the average speed over a swim upstream and back equals…A boat's out-and-back run takes 4 hours when the current is 2 km/h. When the current…