The worker can execute the order for 4 h. And his pupil for 6 h. What part of work they will be able to vyponit working together

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We will take over work on implementation of the order for unit (whole). 1) 1: 4 = 1/4 - a part of work which will be performed by the worker in 1 hour; 2) 1: 6 = 1/6 - a part of work which will be performed by his pupil in 1 hour; 3) 1/4 + 1/6 = 3/12 + 2/12 = 5/12 - a part of work which they will perform together in 1 hour. Answer: 5/12 orders in 1 hour of collaboration. 1: 5/12 = 1 * 12/5 = 12/5 = 2.4 (h) - during this time the worker and the pupil will execute all order if work together.
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Answer add