let Dennis' rate be x km/h
let Elena's rate be x+7 km/h
time taken by Dennis = 60/x
time taken by Elena = 81/(x+7)
but their times are equal, so
60/x = 81/(x+7)
cross-multiply and solve for x
then find x+7 for Elena's rate
I NEED HELP PLEASE!!!!!!!!!!
Elena bicycles 7 km/h faster than Dennis. In the same time it takes Dennis to bicycle 60km, Elena can bicycle 81km. How fast does each bicyclist travel.
Dennis travel_____ km/h
Elena travel ______ km/h
1 answer
1 answer