Another math problem?

0 ⤊

Another math problem?

Alex cycles 5 km to return a friend's bicycle, then walks home. The entire trip takes 1.5 hours. Alex cycles four times as fast as he walks. How fast does he walk? Thank You

2007-06-06 17:00:19 · 2 answers · asked by crobabe2182 1 in Science & Mathematics ➔ Mathematics

2 answers

If it takes him t hours to cycle the distance it will be 4t to walk back, so the total time is 5t = 1.5 hours, so t = 0.3 hours. So it takes him 4×0.3 = 1.2 hours to walk 5km, so he walks at 5/1.2 = 4.2 km/h to 1 d.p.

2007-06-06 17:13:26 · answer #1 · answered by Scarlet Manuka 7 · 0⤊ 0⤋

5/4x + 5/x = 1.5 hr
6x = 5 + 20
x = 25 km/6 hr = 4.17 km/hr

2007-06-06 17:13:10 · answer #2 · answered by Helmut 7 · 0⤊ 0⤋