The leaves

Karel raked the leaves in the garden alone in 24 minutes, and his younger brother took 30 minutes. How long would they dig a garden if Karel digs alone for 6 minutes and his brother comes to his aid?

Correct answer:

t =  16 min

Step-by-step explanation:

K=24 min B=30 min  t/K+(t6)/B=1 t/24+(t6)/30=1  9t=144  t=9144=16  t=16=16 min

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