Answer:
The plumber works 6.25 hours, the builder works 4 hours
Explanation:
The builder worked roughly 12 hours and the plumber worked around 13. The builder got paid 330.75 so just divide 28 by that to get 11.9... then add 330.75 and 106.75 (which will be 437.50) and divide the sum by 35 the get 12.5.
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