Parquet floor

Three workers laid parquet floor for 2.9 hour. The first one would do this work alone 9 hours, the second in 7 hours.

For how many hours would fulfill this work the third worker, if he worked alone?

Result

x =  11 h

Solution:

(x/9 + x/7 + 1) = x/2.9

5.724138x = 63

x = 1827/166 ≈ 11.006024

Calculated by our simple equation calculator.

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