It takes Skyler 10 hours to rake the front lawn while his brother, Sergio, can rake the lawn in 6 hours.  How long will it take them to rake the lawn working together?

Francis is getting new carpet tiles in his living room and den. his living room and den are connected. he needs to figure out how much carpet he needs and the cost involved. if each tile costs $2.00 per sq ft, how much would it cost to have new tile put in the den? a) $24 b) $36 c) $48 d) $54 plz awnser soon