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A boat moves from city X to city Y. What is the speed of the boat

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A boat moves from city X to city Y. What is the speed of the boat  [#permalink]

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New post 31 Jul 2017, 20:49
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A boat moves from city X to city Y. What is the speed of the boat in still water?

(1) Speed of the river current is 3 m/s

(2) The distance between city X and the boat is increasing at the rate of 2 m/s
Spoiler: OA

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Re: A boat moves from city X to city Y. What is the speed of the boat  [#permalink]

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New post 16 Aug 2017, 08:42
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abhishek911 wrote:
This question seems wrong. We need to know whether the river's current is against the boat's direction or along it. The correct answer should be E

Question is correct.
Consider this scenario in which we are considering both statements and it is given the speed of current is 3 m/s and speed of boat is 2m/s.
If the river was flowing in the direction of movement of the boat, the speed of the boat cannot be less than 3m/s.
Hence, we conclude that the river current is in the opposite direction of movement of the boat.
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Re: A boat moves from city X to city Y. What is the speed of the boat  [#permalink]

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New post 31 Jul 2017, 21:00
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Gnpth wrote:
A boat moves from city X to city Y. What is the speed of the boat in still water?

(1) Speed of the river current is 3 m/s

(2) The distance between city X and the boat is increasing at the rate of 2 m/s



S1: No information about the speed of the boat so insufficient.

S2: This statement gives that the speed of the boat in the river including the speed of current is 2m/s. From this we can not find the speed of the boat in still water unless you have the speed of the river current. SO insufficient.

S1&S2 together : We can find the speed of the boat in still water by subtracting the speed of the current.

C is the answer
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Re: A boat moves from city X to city Y. What is the speed of the boat  [#permalink]

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New post 16 Aug 2017, 02:33
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This question seems wrong. We need to know whether the river's current is against the boat's direction or along it. The correct answer should be E
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Re: A boat moves from city X to city Y. What is the speed of the boat  [#permalink]

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New post 16 Aug 2017, 09:04
SaGa wrote:
abhishek911 wrote:
This question seems wrong. We need to know whether the river's current is against the boat's direction or along it. The correct answer should be E

Question is correct.
Consider this scenario in which we are considering both statements and it is given the speed of current is 3 m/s and speed of boat is 2m/s.
If the river was flowing in the direction of movement of the boat, the speed of the boat cannot be less than 3m/s.
Hence, we conclude that the river current is in the opposite direction of movement of the boat.


Got it. Thanks !


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Re: A boat moves from city X to city Y. What is the speed of the boat  [#permalink]

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New post 22 Aug 2017, 03:04
SaGa wrote:
abhishek911 wrote:
This question seems wrong. We need to know whether the river's current is against the boat's direction or along it. The correct answer should be E

Question is correct.
Consider this scenario in which we are considering both statements and it is given the speed of current is 3 m/s and speed of boat is 2m/s.
If the river was flowing in the direction of movement of the boat, the speed of the boat cannot be less than 3m/s.
Hence, we conclude that the river current is in the opposite direction of movement of the boat.



Yes this explaination makes sense . Thanks !!
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Re: A boat moves from city X to city Y. What is the speed of the boat  [#permalink]

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New post 19 Feb 2019, 10:12
Gnpth wrote:
A boat moves from city X to city Y. What is the speed of the boat in still water?

(1) Speed of the river current is 3 m/s

(2) The distance between city X and the boat is increasing at the rate of 2 m/s


The solution and explanations have been provided and I see some people have selected A or B. Even if you are guessing, do it strategically. It should be between C & E all day long!!
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Re: A boat moves from city X to city Y. What is the speed of the boat  [#permalink]

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New post 27 Apr 2019, 06:55
Gnpth wrote:
A boat moves from city X to city Y. What is the speed of the boat in still water?

(1) Speed of the river current is 3 m/s

(2) The distance between city X and the boat is increasing at the rate of 2 m/s



SaGa wrote:
abhishek911 wrote:
This question seems wrong. We need to know whether the river's current is against the boat's direction or along it. The correct answer should be E

Question is correct.
Consider this scenario in which we are considering both statements and it is given the speed of current is 3 m/s and speed of boat is 2m/s.
If the river was flowing in the direction of movement of the boat, the speed of the boat cannot be less than 3m/s.
Hence, we conclude that the river current is in the opposite direction of movement of the boat.


To add to the above explanation:

Case 1: Boat going against the direction of the current


Speed of the boat in still water - Speed of river current = Speed of boat in current

=> Speed of the boat in still water = Speed of boat in current + Speed of river current = 2 + 3 = 5 m/s


Case 2: Boat going in the direction of the current


Speed of the boat in still water + Speed of river current = Speed of boat in current

=> Speed of the boat in still water = Speed of boat in current - Speed of river current = 2 - 3 = -1 m/s (Negative speed is not possible)

Therefore, only case 1 is valid. Hence, ANSWER = C.
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Re: A boat moves from city X to city Y. What is the speed of the boat   [#permalink] 27 Apr 2019, 06:55
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