6.8 5. By checking work records, a contractor finds that Kenny Dewitt can wire a room addition in 9 hr. It takes Betty Wohnt 7 hr to wire the same room. How long would it take if they worked together?
9. The HP Officejet 4215 All-in-one printer, fax, scanner, and copier can print in black one copy of a company's year-end report in 10 min. the HP Officejet 7410 All-in-one can print the same report in 6 min. How long would it take the two printers, working together, to print one copy of the report?
15. A long distance trucker traveled 120 mi in one direction during a snowstorm. The return trip in rainy weather was accomplished at double the speed and took 3 hr less time. Find the speed going.
Examples was shown as this truck going forward 120 mi, r, t
Coming back 120 mi, 2r, t-3
See attached file for full problem description.
It shows how to solve the equations with fractions. Also, it investigates the together and alone word problems. The response is detailed and has a '5/5' rating.