document.write( "Question 908325: it takes bob 10 hours to clean his room. It takes his mom 5 hours to clean his room. If bob starts cleaning at 1 pm and his mother starts helping at 2pm at what time will bob's room be clean? \n" ); document.write( "
Algebra.Com's Answer #550969 by josmiceli(19441)![]() ![]() You can put this solution on YOUR website! From 1 PM to 2 PM is 1 hr \n" ); document.write( "------------------------ \n" ); document.write( "Bob's rate of cleaning is: \n" ); document.write( "( 1 room ) / ( 10 hrs ) = \n" ); document.write( "-------------------- \n" ); document.write( "The fraction of the room cleaned by \n" ); document.write( "Bob in \n" ); document.write( " \n" ); document.write( "------------------------------- \n" ); document.write( "That means there is \n" ); document.write( "room left to clean \n" ); document.write( "----------------- \n" ); document.write( "Add Bob's rate and his Mom's rate to \n" ); document.write( "get their rate working together: \n" ); document.write( "Let \n" ); document.write( "finish working together \n" ); document.write( " \n" ); document.write( "Multiply both sides by \n" ); document.write( " \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "------------- \n" ); document.write( "3 hrs after 2 PM is 5 PM \n" ); document.write( "They will finish cleaning the room at 5 PM\r \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |