- A5 km/h
- B4 km/h
- C6 km/h
- D1 km/h
Step-by-Step Solution
Upstream = 0.75 ÷ (11.25/60) = 4 km/h; downstream = 0.75 ÷ (7.5/60) = 6 km/h. Still water = (4 + 6) ÷ 2 = 5 km/h.
Answer: A) 5 km/h
Mukesh can row three-quarters of a kilometre against the stream in 11¼ minutes and return in 7½ minutes. What is his 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
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…A boat's downstream and upstream speeds are in the ratio 7 : 3, and the current flows at…