Word problem.?

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A student waljs and jogs to college each day. The students averages 5km/h walking and 9km/h jogging. The distance from from home to college is 8km, and the student makes the trip in 1 hour. How far does the student jog?

2007-03-05 15:27:10 · 2 answers · asked by boyz_inblu3 1 in Science & Mathematics ➔ Geography

2 answers

8 kmph = x hours * 5 kmph + y hours * 9 kmph
...and x hours + y hours = 1 hour (y = 1hr - x hr)
8 = x5 + (1-x)9
8 = 5x+9-9x
-1 = -4x
1/4 = x

spent 15 minutes walking and 45 minutes jogging..
.75*9 = 6.75 miles jogged.

2007-03-05 15:59:41 · answer #1 · answered by Jennifer B 3 · 0⤊ 0⤋

2 km..................

2007-03-05 15:34:21 · answer #2 · answered by Anonymous · 0⤊ 1⤋