Hi, 

Let x represent the time it takes them together

Using perhour as an equalizer

1/6hrs + 1/4hrs = 1/x

mutiplying each term on both sides o fequation by 12x, so as all denonminators = 0

2x + 3x = 12

5x = 12

x = 12/5 Or  2 2/5 hrs Or 2hr and 24 min 

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