j=p+5
60/p = 75/j
60/p = 75/p+5
60p + 300 = 75p
15p = 300
p=20
so, j=25
60/20 = 75/25
_______________________
Let b be the time it takes both machines together
1/b = 1/20 + 1/14 = 34/280
b = 280/34 = 140/17
1. Jodie biycles 5km/h faster than Predup. In the same time it takes Predup to bicycle 60km, Jodie can bicycle 75km. How fast does each bicyclist travel?
2.The officejet printer can copy Janet's dissertation in 20min. The LaserJet printer can copy the same document in 14min. If the two machine work together ,how long would they take to copy the dissertation.
1 answer
2 answers