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TG sir, please help me with this lr problem:

A certain city is served by subway lines A,B and C and numbers 1 2 and 3
1.When it snows , morning service on B is delayed
2.When it rains or snows , service on A, 2 and 3 are delayed both in the morning and afternoon
3.When temp. falls below 30 degrees farenheit afternoon service is cancelled in either the A line or the 3 line, but not both.
4.When the temperature rises over 90 degrees farenheit, the afternoon service is cancelled in either the line C or the 3 line but not both.
5.When the service on the A line is delayed or cancelled, service on the C line which connects the A line, is delayed.
6.When service on the 3 line is cancelled, service on the B line which connects the 3 line is delayed.

Q1. On Jan 10th, with the temperature at 15 degree farenheit, it snows all day. On how many lines will service be affected, including both morning and afternoon.
(A) 2
(B) 3
(C) 4
(D) 5

Q2. On Aug 15th with the temperature at 97 degrees farenheit it begins to rain at 1PM. What is the minimum number of lines on which service will be affected?
(A) 2
(B) 3
(C) 4
(D) 5

Q3. On which of the following occasions would service be on the greatest number of
lines disrupted.
(A) A snowy afternoon with the temperature at 45 degree farenheit
(B) A snowy morning with the temperature at 45 degree farenheit
(C) A rainy afternoon with the temperature at 45 degree farenheit
(D) A rainy afternoon with the temperature at 95 degree farenheit

hi sahil

i am not sure about this answers

1)5 {as it is given that whenever A gets delayed or cancelled c is affected and b is affected when 3 is cancelled.

now for a snowy morning B,A,2,3 gets affected ,and for a temperature fall below 30 A or 3 gets cancelled,,,as A already caused a delay for c it doesn't cause any difference in 3 or A
getting cancelled. the lines getting affected is (A,B,C,2,3)

2)4

we are asked to find out the minimum number of service affected

for temp above 90 whether c or 3 gets cancelled ,for a rainy afternoon A,2 and 3 gets delayed, as c is definitely going to be affected by the delay caused by A it's better to make c cancelled for above 90 degree condition

and the affected lines will be A,2,3and C

3)answer is b

anyone please post the answers if u have and let me know if i am wrong

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	Re: Help required for a LR prob!!! by Ravi Kumar - Tuesday, 9 October 2012, 02:00 AM
	VIVEK231, MY ALL ANSWERS ARE COMING OUT TO BE SAME AS URS. SO 1-D 2-C 3-B Show parent \| Reply

	Re: Help required for a LR prob!!! by Aswath Ravishankar - Wednesday, 10 October 2012, 11:34 AM
	your second answer is wrong.. the correct answer is 5.. (check the last point) when the line 3 is cancelled,B is also delayed. I'm not sure about the third. Show parent \| Reply

Aswath Ravishankar
please read all points again and carefully.
point 2 says "When it rains or snows , service on A, 2 and 3 are delayed both in the morning and afternoon"

last point says "When service on the 3 line is cancelled, service on the B line which connects the 3 line is delayed."

now question asks:
minimum number of lines on which service will be affected.

Farenheit it begins to rain at 1PM. So its raining so point 2 will follow. So, service on A, 2 and 3 will be delayed.
Temperature at 97 degrees so point 4 will follow.So afternoon service of 3 or c will be cancelled but not both. As already due to rain service of 3 is delayed so we will cancel the service of 3. So for minimum we will cancel the service of 3.
Hope u get it.

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	Re: Help required for a LR prob!!! by Aswath Ravishankar - Monday, 15 October 2012, 10:36 AM
	dude when you say third line is cancelled it means B line is affected.. so makes it four.. and read the 5th point which says when A is delayed,C is also affected. so it makes 5 man! Show parent \| Reply

hi ashwath

this is my method,

when it's raining in afternoon a,2and3 get's delayed

when temp raises above 90 C or 3 gets cancelled but not both

inorder to minimise the no of affected trains we have to choose C as cancelled train as it will be already affected by the delay of A

now i think u have misunderstood the last point which says b will not be affected unless 3 gets cancelled here 3 is only getting delayed not cancelled

so the AFFECTED TRAIN WILL BE A,2,3AND C

please correct me if i am wrong

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