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September 16, 2014

September 16, 2014

Posted by **Ernie** on Sunday, October 6, 2013 at 10:23pm.

- algebra -
**Reiny**, Monday, October 7, 2013 at 12:03amlet man's walking speed be x ft /s

so speed with moving sidewalk = x+2 ft/s

time taken to walk 93 ft on moving sidewalk

= 93/(x+2)

times taken to walk 12 ft in opposite direction

= 12/(x-2)

93/(x+2) = 12/(x-2)

93x - 186 = 12x + 24

81x = 210

x = 210/81 ft/s = 70/27 or appr 2.59 ft/sec

check:

time to walk 93 ft at 4.59 ft/sec = 93/4.59 = 20.26 sec

time to walk 12 ft at .59 ft/sec = 20.3 sec

small error due to round-off

Answer is correct.

- algebra -
**Ernie**, Monday, October 7, 2013 at 1:32pmThank you so much.

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