Twin brothers, person a and person b, can mow their grandparent's lawn together in 18 minutes. person a could mow the lawn by himself in 15 minutes less time than it would take person b. how long would

Twin brothers, person a and person b, can mow their grandparent's lawn together in 18 minutes. person a could mow the lawn by himself in 15 minutes less time than it would take person

b. how long would it take person b to mow the lawn by himself?

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