Brain Teaser - Riding against the wind
05-24-2015, 03:24 PM
Post: #2
 Gerson W. Barbosa Senior Member Posts: 1,454 Joined: Dec 2013
RE: Brain Teaser - Riding against the wind
#1 only:

r = rider's speed
w = wind speed

r + w = 1/3 mi/min (1)
r - w = 1/4 mi/min (2)

From (1), w = 1/3 - r

Replacing this in (2) it follows that

r - 1/4 = 1/3 - r
2*r = 1/3 + 1/4
2*r = 7/12

r = 7/24 [mi/min]

t = 1 [mi]/(7/24 [mi/min]

t = 24/7 [min]
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 Messages In This Thread Brain Teaser - Riding against the wind - CR Haeger - 05-24-2015, 01:56 PM RE: Brain Teaser - Riding against the wind - Gerson W. Barbosa - 05-24-2015 03:24 PM RE: Brain Teaser - Riding against the wind - CR Haeger - 05-24-2015, 04:49 PM RE: Brain Teaser - Riding against the wind - Gerson W. Barbosa - 05-24-2015, 05:41 PM RE: Brain Teaser - Riding against the wind - CR Haeger - 05-24-2015, 06:34 PM RE: Brain Teaser - Riding against the wind - Claudio L. - 05-28-2015, 06:24 PM RE: Brain Teaser - Riding against the wind - CR Haeger - 05-28-2015, 02:10 PM RE: Brain Teaser - Riding against the wind - Claudio L. - 05-28-2015, 07:04 PM RE: Brain Teaser - Riding against the wind - CR Haeger - 05-28-2015, 08:33 PM RE: Brain Teaser - Riding against the wind - Claudio L. - 05-29-2015, 01:40 PM

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