Question

Bethany can mow her family’s lawn in 4 hours. Her brother Colin can mow the lawn in 3 hours. Which equation can be used to find x, the amount of time it would take for Bethany and Colin to mow the lawn together?

Answer 1

hi,
\[\frac{ 1 }{ time \ by \ bethany } + \frac{ 1 }{ time \ by \ colin } = \frac{ 1 }{ time together }\]
\[\frac{ 1 }{4 } + \frac{ 1 }{ 3 } = \frac{ 1 }{ time together }\]
\[\frac{ 7 }{12 } = \frac{ 1 }{time \ together }\]
\[time \ together = \frac{ 12 }{ 7 }\]
\[time together = 1 . 71 \ hours\\]

hope this will help ya!!

Answer 2

thank you @***[ISURU]***