UPSC Prelims 2013·CSAT·Logical Reasoning·Arrangement and Puzzles

Five cities P, Q, R, S and T are connected by different modes of transport as follows: P and Q are connected by boat as well as rail. Sand R are connected by bus and boat. Q and T are connected by air only. P and R are connected by boat only. T and R are connected by rail and bus. Which mode of transport would help one to reach R starting from Q, but without changing the mode of transport?

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Last updated 8 Jul 2026, 4:39 pm IST
  1. ABoatCorrect
  2. BRail
  3. CBus
  4. DAir

Explanation

To reach R from Q without changing the mode of transport, we must find a continuous path using a single mode.

  1. Consider the path Q -> P -> R.

    • Q and P are connected by boat and rail.
    • P and R are connected by boat only.
    • If we choose 'boat' from Q to P, we can continue by 'boat' from P to R. This makes 'Boat' a continuous mode of transport from Q to R.

  2. Consider the path Q -> T -> R.

    • Q and T are connected by air only.
    • T and R are connected by rail and bus.
    • There is no direct air connection from T to R, so this path requires changing the mode of transport.

Therefore, the only mode of transport that allows one to reach R starting from Q without changing the mode is Boat (via P).

The final answer is A) Boat.

Logical Reasoning: Five cities P, Q, R, S and T are connected by different modes of transport as follows: P and Q are connected by boat as
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