John's house and his school are 2km apart. One morning John walked to his school at an average speed of 30m/min for a few minutes, then ran the rest of the way at an average speed of 100m/min. If it took 34 minutes altogether, how many meters did John run?

Question

anonymous · Answer

Let us say
x = how many minutes john walked
y = how many minutes john run
x+y= 34 minutes  so 30x + 30y = 1020
30*x + 100*y = 2km = 2000m
Eliminate x:
70y = 980  y = 14 
Let put y value one of the equations
X + 14 = 34  x = 20

anonymous · Answer

because first variable is 20 second variable is 14

anonymous · Answer

i mean 20*30 + 14*100 = 2000

anonymous · Answer

thanks radar, bkalkan