distance = 65(50/60) = 325/6 km
rate needed to have a time of 40 minute
= (325/6) / (40/50
= (325/6)(5/4) = 1625/24 km/h or appr 67.7 km/h
1) at 65kph,mrs Escarcha can reach home within 50 mins.at what rate should she drive her car so that he can reach home 10 minutes earlier?
2) Five people can finish painting a wall within 5 hours. if only 3 people are available, how many hours do they have to work to finish the same job?
2 answers
#2
job needs 25 man-hours to complete.
so if 3 men work, number of hours
= 25/3 hrs, or 8 hours and 20 minutes
job needs 25 man-hours to complete.
so if 3 men work, number of hours
= 25/3 hrs, or 8 hours and 20 minutes