- A3 hours
- B1.8 hours
- C2.25 hours
- D4 hours
Step-by-Step Solution
Upstream speed = 8 − 2 = 6 km/h. Time = 18 ÷ 6 = 3 hours. (2.25 h uses the still-water speed.)
Answer: A) 3 hours
Speed of a boat in still water: 8 km/h. Speed of the current: 2 km/h. Find the time taken to row 18 km upstream.
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
Tenzing paddles his kayak upstream at 5 km/h on a river flowing at 2 km/h. What would…A boat's downstream speed is 40 km/h and its upstream speed is 28 km/h. What is the sum…A floating coconut is carried 600 m by the stream in 10 minutes. What is the speed of…Upstream speed 10 km/h; downstream speed 16 km/h. How long does the boat need to go 48…Which pair could be the downstream and upstream speeds of a boat whose speed in still…