49. election campaign. alex, becky, and courtney volun-
teered to stuff 741 envelopes with newsletters for senator
douglas's reelection campaign. alex could assemble 124 per
hour; becky, 118 per hour; and courtney, 132 per hour. they
worked a total of 6 hours. the sum of the number of hours
that becky and courtney spent was twice what alex spent.
how long did each of them work?