Question 1095128

three men can individually do a job in 5,6 and 7 hours respectively . what fractions of the entire job is done by the three men together in 1 hour?
<pre>Fastest can do the job in 5 hours, or {{{1/5}}} of the job in 1 hour
Second fastest can do the job in 6 hours, or {{{1/6}}} of the job in 1 hour
Slowest can do the job in 7 hours, or {{{1/7}}} of the job in 1 hour
In 1 hour the 3 can do: {{{highlight_green(matrix(1,5, 1/5 + 1/6 + 1/7, "=", 107/210, of, job))}}}