Andy C. answered • 11/25/17

Math/Physics Tutor

Tom can do 1/12 fence per hour.

Together they must do 1/8 fence per hour.

1/12 + X = 1/8

X = 1/8 - 1/12 = 3/24 - 2/24 = 1/24

Bob must be able to construct the fence within a 24 hour period.

John J.

asked • 11/20/17the question says “a rectangular animal pen is built. One side of it is the wall of a barn. It is 1680 ft sq. If Tom can put up the fence in 12 hours, how fast will bob have to work so that the fence is put up in 8 hours? How long will it take bob to do it on his own?”

im so confused. Please help me :(

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Andy C. answered • 11/25/17

Math/Physics Tutor

Tom can do 1/12 fence per hour.

Together they must do 1/8 fence per hour.

1/12 + X = 1/8

X = 1/8 - 1/12 = 3/24 - 2/24 = 1/24

Bob must be able to construct the fence within a 24 hour period.

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