The GATE Grind

GATE 2019 ME (ME1) – Question 3

General Aptitude · Quantitative Aptitude: Arithmetic and Number Computation · 1 mark · Multiple choice

A worker notices the factory clock’s hour hand moved 225° during her stay. For how long did she stay?

  1. 3.75 hours
  2. 4 hours and 15 minutes
  3. 8.5 hours
  4. 7.5 hours

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Show answer and explanation

Correct answer: (D) 7.5 hours

Explanation

The hour hand turns $360^\circ$ in 12 hours, or $30^\circ$ per hour. Duration is $225/30=7.5$ hours. **D**.