A worker can do a job in 4 hours and another worker can do it in 2 hours. How many such works can they do together in 4 hours?

A worker can do a job in 4 hours and another worker can do it in 2 hours. How many such works can they do together in 4 hours? Correct Answer 3

In 1 hour A can do in 1/4 portion So, in 4 hours A can do 4/4 = 1 portion(full) In 1 hour B can do in 1/2 portion In 4 hours B can do in 4/2 = 2 portion So, (A + B) together in 4 hours can do (1 + 3)portion = 3 portion (Answer) 
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