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# I need help ASAP.

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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

May 1, 2021