Concept explainers
* Jay and Mark run a lawn-mowing service. Mark’s mower is twice as big as Jay’s, so whenever they both mow, Mark mows twice as much as Jay in a given time period. When Jay and Mark are working together, it takes them 4 hours to cut the lawn of an estate. How long would it take Mark to mow the lawn by himself? How long would it take Jay to mow the lawn by himself? Explain your answers.
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