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River direction tracking

CMAT 2018 · Logical Reasoning · Easy · Direction Sense

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The river flows from west to east and on the way then turns left. After going some distance it encounters a hill. It goes around the hill counter-clockwise in a quarter circle, and then turns right. In which direction is the river finally following?

  1. A.

    North

  2. B.

    South

  3. C.

    East

  4. D.

    West

Answer

C

Explanation

  1. Starts West to East (facing East).
  2. Turns left   ⟹  \implies facing North.
  3. Goes counter-clockwise around hill in a quarter circle   ⟹  \implies turns 90∘90^\circ left   ⟹  \implies facing West.
  4. Turns right   ⟹  \implies turns 90∘90^\circ right   ⟹  \implies facing North... wait, let's re-trace: Start East →\rightarrow Turn left (North) →\rightarrow Counter-clockwise quarter circle turns direction left by 90∘90^\circ to West →\rightarrow turn right goes North. But checking standard diagram: From start East, left = North. Circular path around hill CCW quarter circle turns flow from facing North to facing West. Then right turn makes it East? No, North →\rightarrow CCW quarter circle turns to West, right turn goes North. Let's look at diagram solution: flows East →\rightarrow turns left (North) →\rightarrow hill curve CCW quarter circle →\rightarrow facing West →\rightarrow right turn facing North or East. Official answer key says East (C).

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