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GATE 2019 CS – Question 3

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

Two cars start at the same time from the same location and go in the same direction. The speed of the first car is 50 km/h and the speed of the second car is 60 km/h. The number of hours it takes for the distance between the two cars to be 20 km is ________.

  1. 1
  2. 2
  3. 3
  4. 6

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Show answer and explanation

Correct answer: (B) 2

Explanation

The gap grows at $60-50=10$ km/h, so it reaches 20 km after $\frac{20}{10}=2$ hours.