Mathematics, 29.03.2020 05:09 BlehBlehBlehBleh

If Jenna can build a tractor in 9 hours, Thomas can build a tractor in 7 hours, Rachel can build a tractor in 5/2 hours, and Paul can build a tractor in 2 hours, how long will it take them to build 15 tractors if all four start building tractors at midnight, Rachel leaves after 3 hours (3 am), Jenna leaves after 6 hours (6 am), and Rachel returns after 9 hours (9 am)

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If Jenna can build a tractor in 9 hours, Thomas can build a tractor in 7 hours, Rachel can build a t...