Grass garden

Mr. Grass would itself be mowed garden for 5 hours. His son Michael could do it for 7 hours. They agreed that they wake up at 5 am and begins to mow together. Ms. Grass needs drive into town at 8.30. Michael says that at that time they're done with work. Is he right?

Result

Solution:

$x(1/5+1/7) = 1 \ \\ x = 35⁄12 \ h ≐ 2.916667 \ h \ \\ x < 8.50 - 5.00 \ \\ 2.916667 < 3.50$

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