Three carnivorous plant growers each sell the same types of plants: Venus fly traps, sundews, and bladderworts. In one hour, the first grower sells 3 fly traps, 1 sundews, and 2 bladderworts. The second grower sells 1 Venus fly traps, 2 sundews, and 1 bladderworts in an hour. In the same amount of time, the third grower sells 3 Venus fly trap, 2 sundews, and 2 bladderworts.

Find the number of selling hours are needed on behalf of each grower so that they collectively sell 52 Venus fly traps, 42 sundews, and 39 bladderworts