The GATE Grind

GATE 2019 EE – Question 4

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

It takes two hours for a person X to mow the lawn. Y can mow the same lawn in four hours. How long (in minutes) will it take X and Y, if they work together to mow the lawn?

  1. 60
  2. 80
  3. 90
  4. 120

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Correct answer: (B) 80

Explanation

The combined rate is $\frac12+\frac14=\frac34$ lawn per hour, so the time is $\frac43$ hours $=80$ minutes.