In a stream running at 2 km/h, a motor boat goes 10 km upstream and back again…
2025
In a stream running at 2 km/h, a motor boat goes 10 km upstream and back again to the starting point in 55 min. The speed of the motorboat in still water is
- A.
22 km/h
- B.
21 km/h
- C.
20 km/h
- D.
24 km/h
Attempted by 9 students.
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Correct answer: A
Answer: Option A
Let "x" be the speed of Motor boat in still water
Distance = 10 km; Time = 55/60 hrs
For upstream, the speed of motorboat = x - 2
For downstream, the speed of motorboat = x + 2
55 / 60 = 10/ (x – 2) + 10/(x + 2) So, x = 22.