5. the water current is 3mph. going upstream for 36 miles against the current takes one hour longer than going the same distance downstream with the current. find the speed of the boat in still water. thanks?
To learn how to set up and solve "uniform rate" problems, try here
If the boat's rate (according to the speedometer) is "b", then upstream is b - 3 and downstream is b + 3. Use "d = rt", etc.
7. together bart and lisa require 3 hours and 36 mins to clean the house. Alone, bart would require 3 hours more than lisa. how long would it take lisa to clean the house alone? pls incluce the equation and how to solve it
To learn how to set up and solve "work" problems, try here
It would probably help to convert the times to just hours (15/5 and 3) or just minutes (216 and 180), in order to simplify calculations.
There are loads of worked examples, tables, and explanations. Once you've studied the lessons, please attempt the exercises. If you get stuck, please reply showing your efforts so far. Thank you!