unit rate of first crew = 1/12 parkinglots/hour
unit rate of 2nd crew = 1/16 pl/h
combined rate = (1/12 + 1/16) pl/h = 7/48 pl/hr
time = 1 pl/(7/48 pl/hr)
= 48/7 hours or 6.857 hours or 6 hours and appr 51 minutes
One crew can seal a parking lot in 12 hours and another in 16 hours. How long will it take to seal the parking lot if the two crews work together?.
hr
1 answer