armanp1997 armanp1997 12-07-2017 Mathematics contestada BILL CAN HAMMER 20 NAILS IN 6 MINUTES. JEFF CAN DO THE SAME JOB IN ONLY 5 MINUTES. HOW LONG WILL IT TAKE THEM TO FINNISH IF BILL HAMMERS THE FIRST 5 NAILS, THEN JEFF HAMMERS FOR 3 MINUTES, THEN BILL FINISHES THE JOB?