GATE EE 2019 Set 1 — Question 4
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Question
It takes two hours for a person to mow the lawn. can mow the same lawn in four hours. How long (in minutes) will it take and , if they work together to mow the lawn?
Correct answer
(B) 80
Solution
Let the total work be 1 unit (the lawn).
Rate of lawn per hour.
Rate of lawn per hour.
Combined rate of and lawn per hour.
Time taken to mow the lawn together = hours.
To convert hours to minutes: minutes.
Rate of lawn per hour.
Rate of lawn per hour.
Combined rate of and lawn per hour.
Time taken to mow the lawn together = hours.
To convert hours to minutes: minutes.
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