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An event at Super Race Day is the Lawnmower Derby. Team members try to mow a standard-size lawn as quickly as possible.

Terri and Candace can mow the lawn in 18 min. If it takes Candace 30 min to mow a lawn alone, how long does it take Terri to mow the lawn alone?

 Apr 30, 2021
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Terri and Candace can mow the lawn in 18 min

⇒In 1 min Terri and Candace can mow = \({1 \over 18}\) part of the lawn

 

Candace alone can mow the lawn in 30 min

⇒ In 1 min Candace can mow = \({1\over 30}\) part of the lawn

 

So, in 1 min Terri alone can mow  \(=({1\over 18} - {1\over 30})\) part of the lawn

                                                      \(={12 \over 540}\)

                                                      \(={1 \over 45}\) 

 

∴ Terri alone can mow the lawn in 45 min. 

 

~Amy smiley

 May 1, 2021

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