You can put this solution on YOUR website! A man cycles for x hours at 12km/h and y hours at 18km/h. Altogether he cycles 78km in 5hours.
Find x and y
:
Write an equation for the time and one for the distance
:
x + y = 5
x = (5-y); use this for substitution
:
12x + 18y = 78
Replace x
12(5-y) + 18y = 78
60 - 12y + 18y = 78
-12y + 18y = 78 - 60
6y = 18
y = 3 hrs
:
You can find x
