Questions on Boats/Airplanes. For problems with boats and streams, Speed of the boat upstream (against the current) = Speed of the boat in still water � speed of the stream. [As the stream obstructs the speed of the boat in still water, its speed has to be subtracted from the usual speed of the boat]. Speed of the boat downstream (along with the current) = Speed of the boat in still water + speed of the stream. [As the stream pushes the boat and makes it easier for the boat to reach the destination faster, speed of the stream has to be added].� A boat covers a certain distance in 2 hours, while it comes back in 3 hours. If Trawler Fishing Boat For Sale In The Philippines China the speed of the stream is 4 kmph, what is the boat�s speed in still water? A) 30 kmph B) 20 kmph C) 15 kmph D) 40kmph. Answer 1. B. Explanation. In order to calculate the speed of the boat upstream and downstream, we should know the speed of the boat in still water(B) and speed of the stream (S). Examples: Input: B = 10, S = 4 Output: Speed Downstream = 14 km/hr. Speed Upstream = 6 km/hr. Input: B = 12, S = 5 Output: Speed Downstream = 17 km/hr. Speed Upstream = 7 km/hr. Recommended: Please try your approach on {IDE} first, before moving on to the solution. Approach: The direction along the stream is called downstream and the direction opposite the stream is called upstream. So in case of downstream the speeds will be added, whil. upstream speed of boat = supstream = v - c. downstream speed of boat = sdownstream = v + c. Upstream data: d = 70 miles, t = hours. supstream = 70 miles/ hours = 70/ (miles/hr) = miles/hr. Downstream data: d = 70 miles, t = 5 hours. sdownstream = 70 miles/5 hours = 10/5 (miles/hr) = 14 miles/hr. a). With this, we arrive at the following equations for the upstream and downstream speeds of the boat� Using our given info, we can use our distance formula to set up our 2 equations: 1. Our upstream given info is D = 70, R = v - c (speed going against the current), T = ; so our upstream equation is (v - c) = 2. Our downstream given info is D = 70, R = v + c (speed going with the current), T = ; so our downstream equation is (v + c) = Part (b).

When we move upstream, our speed gets deducted from the speed of the stream. Similarly when we move downstream our speed gets added. Example 1: A boat travels equal distance upstream and downstream. What is the speed of the boat in still water? Example 2: A boat travels equal distance upstream and downstream.

What is the speed of the current? Example 3: A boat is rowed down a river 28 km in 4 hours and up a river 12 km in 6 hours. Find the speed of the boat and the river. Solution: Downstream speed is ,. Speed of current Downstream�Upstream speed. When the river is running at 1.

How far is the place? A man rows a certain distance downstream in X hours and returns the same distance in Y hours. Example 5: Vikas can row a certain distance downstream in 6 hours and return the same distance in 9 hours. Example 6: Two ferries start at the same time from opposite sides of a river, travelling across the water on routes at right angles to the shores.

Each boat travels at a constant speed though their speeds are different. They pass each other at a point m from the nearer shore. Both boats remain at their sides for 10 minutes before starting back.

On the return trip they meet at m from Speed Of The Boat In Still Water Is 11 Kilometres Per Hour It the other shore. Find the width of the river. Using i , we get. Using ii ,. Stream: It implies that the water in the river is moving or flowing. Upstream: Going against the flow of the river. Downstream: Going with the flow of the river. Still water: It implies that the speed of water is zero generally, in a lake. Quicker Method to solve the Questions.

Let the required distance be x km. Solution: Let the width of the river be x. Let a, b be the speeds of the ferries. Home G. Maths Reasoning Computer English. Share this page!

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