Together, bob and tom take 4 hours to get the yard work done. if bob works alone, it takes him 6 hours. how long
would it take tom, working alone, to do all of the yard work?

The answer is 12 and let me tell you how can you get to that conclussion:The answer is 12 and let me tell you how can you get to that conclussion:Let X be the number of hrs Tom takes to do itThe answer is 12 and let me tell you how can you get to that conclussion:Let X be the number of hrs Tom takes to do itAdd their rates of workingThe answer is 12 and let me tell you how can you get to that conclussion:Let X be the number of hrs Tom takes to do itAdd their rates of working( 1 yard ) / ( 6 hrs ) + ( 1 yard ) / ( X hrs ) = ( 1 yard ) / (4 hrs ) and then what you do isThe answer is 12 and let me tell you how can you get to that conclussion:Let X be the number of hrs Tom takes to do itAdd their rates of working( 1 yard ) / ( 6 hrs ) + ( 1 yard ) / ( X hrs ) = ( 1 yard ) / (4 hrs ) and then what you do is1/6 + 1/x = 1/4The answer is 12 and let me tell you how can you get to that conclussion:Let X be the number of hrs Tom takes to do itAdd their rates of working( 1 yard ) / ( 6 hrs ) + ( 1 yard ) / ( X hrs ) = ( 1 yard ) / (4 hrs ) and then what you do is1/6 + 1/x = 1/4Remember to multiply both sides by 12xThe answer is 12 and let me tell you how can you get to that conclussion:Let X be the number of hrs Tom takes to do itAdd their rates of working( 1 yard ) / ( 6 hrs ) + ( 1 yard ) / ( X hrs ) = ( 1 yard ) / (4 hrs ) and then what you do is1/6 + 1/x = 1/4Remember to multiply both sides by 12xthen = 2x + 12 = 3x