Algebrakm/h
posted by Kelly .
Maria bicycles 4km/h faster than Javier. In the same time that it takes Javier to bike 60km, Maria bikes 72km. How fast does each bicyclist travel?

m=j+4
60/j = 72/m
60/j = 72/(j+4)
60(j+4) = 72j
60j + 240 = 72j
240 = 12j
20 = j
24 = m
They both bike for 3 hours to cover the indicated distances.
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