Three men can individuallý do a job in 5,6 and 7
hours respectively. What fraction of the entire job
is done by the three men together in 1 hour?
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A, B and C can individually complete a task in 5, 6 and 7 h respectively.
In 1 h, A, B and C can complete (1/5), (1/6) and (1/7) of the task respectively.
Fraction of task completed by A, B and C in 1 h = (1/5) + (1/6) + (1/7) = (42 + 35 + 30)/210 = 107/210
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