Question 363071
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Hi, 
Let x represent the time it would take them to mow that lawn together 
{{{1/5 + 1/6 = 1/x}}}   Letting "per hour" be the equalizer

Multiplying each term on both sides of the equation by 30x in order for all denominators to = 1
6x + 5x = 30
11x = 30
x = 2.727 hrs together