Question 622109
Arif walks for x hours at 5km/h and runs for y hours at 10km/h.  He travels a total of 35km and his average speed is 7km/h.  Find the value of x and y.
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5x + 10y = 35 (distance) --> x + 2y = 7
t = d/r = 35/7 = 5 hours
x + y = 5
x + 2y = 7
---------------- Subtract
-y = -2
y = 2
x = 3