Exercise :: Problems on Trains - Data Sufficiency 3
Each of these questions is followed by three statements. You have to study the question and all the three statements given to decide whether any information provided in the statement(s) is redundant and can be dispensed with while answering the given question.
Answer: Option D
From the statement I, we get length of the train is 200 metres (Redundant info while comparing with Statement III). The rest of the info given in this statement cannot be used for calculating the speed of the train, because the two trains might run at different speed.
So, the train will reach city X at 3 p.m.
Hence II and III only gives the answer.
Answer: Option E
Let the length of the train P be x metres.
II. These trains are running in opposite directions.
III. Length of the train Q is 180 m.
Thus, even with I, II and III, the answer cannot be obtained.
Correct answer is (E).