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A boat M leaves Shore A and at the same time boat B leaves

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A boat M leaves Shore A and at the same time boat B leaves [#permalink] New post 30 Jun 2006, 08:34
A boat M leaves Shore A and at the same time boat B leaves shore B. They move across the river .they met at 500 yards away from A and after that they met 300 yards from shore b without halting at shores. Find the distance between the shore A and B.

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Brajesh
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 [#permalink] New post 30 Jun 2006, 08:59
1200.

Slightly tricky wordings.

The boats first met after 500yards from A.
Let the total distance between A and B be x.

then,
500/a = x-500/b,
where, a = speed of A,
b =speed of B.

Assuming both boats are coming back to their original start place without halting at the shores,
Distance coverred by A = x + 300
Distance covered by B = 2x - 300

x+300/a = 2x-300/b

From above,
500/x-500 = x+300/2x-300

Solve, for x = 1200
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 [#permalink] New post 30 Jun 2006, 10:10
I think the question is ambiguous.
There are three solutions:

1. When both A and B touches the other shore atleast once.
2. When A touches the other shore and B did not even reach the other shore
3. When B touches the other shore and A did not even reach the other shore

1. 500/a = x-500/b i.e a/b = 500/(x-500)

(2x-300)/b = (x+300)/a i.e a/b =

Solving these two we get x = 1200

2. 500/a = x-500/b i.e a/b = 500/(x-500)

(x+300)/a = 300/b i.e a/b = (x+300)/300

Solving these two we get x = 100(1+SQRT(31))

3. 500/a = x-500/b i.e a/b = 500/(x-500)

(2x-300)/b = (x-300)/a i.e a/b = (x-300)(2x-300)

Solving these two we get x = 100(7+SQRT(19))
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 [#permalink] New post 30 Jun 2006, 11:14
There is no ambiguity.

A boat M leaves Shore A and at the same time boat B leaves shore B. They move across the river .they met at 500 yards away from A and after that they met 300 yards from shore b without halting at shores. Find the distance between the shore A and B.

I think sgrover has the right approach.
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 [#permalink] New post 30 Jun 2006, 12:08
Futuristic wrote:
There is no ambiguity.

A boat M leaves Shore A and at the same time boat B leaves shore B. They move across the river .they met at 500 yards away from A and after that they met 300 yards from shore b without halting at shores. Find the distance between the shore A and B.

I think sgrover has the right approach.


Please see the attched figure. There are three cases....
Attachments

Cases.JPG
Cases.JPG [ 9.89 KiB | Viewed 984 times ]


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SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008

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 [#permalink] New post 30 Jun 2006, 20:34
sgrover wrote:
1200.

Slightly tricky wordings.

The boats first met after 500yards from A.
Let the total distance between A and B be x.

then,
500/a = x-500/b,
where, a = speed of A,
b =speed of B.

Assuming both boats are coming back to their original start place without halting at the shores,
Distance coverred by A = x + 300
Distance covered by B = 2x - 300

x+300/a = 2x-300/b

From above,
500/x-500 = x+300/2x-300

Solve, for x = 1200


One thing I don't understand.
Why did you equate the time taken by boat A and time taken by boat B?
[500/a = x-500/b]

Regards,
Brajesh
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 [#permalink] New post 01 Jul 2006, 10:52
not clear question.. 8-)
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  [#permalink] 01 Jul 2006, 10:52
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A boat M leaves Shore A and at the same time boat B leaves

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