Question

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?

Answer 1

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

Answer 2

#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