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A journey of 210 miles from a rock on Mars to another rock

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Senior Manager
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A journey of 210 miles from a rock on Mars to another rock [#permalink] New post 30 Jan 2004, 17:01
A journey of 210 miles from a rock on Mars to another rock on Mars :lol: takes four hours less by a fast NASA Mars buggy than a slow NASA Mars buggy. If the average speed of the slow buggy is 40 mph less than that of the fast buggy, find the average speed of faster buggy.

a. 55mph
b. 45
c. 40
d. :ninja :fu
e. none of these
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 [#permalink] New post 30 Jan 2004, 17:16
210 = (t-4)y = t(y-40)

(t-4)/t = (y-40)/y

=> y = 10t

21 = (t-4)t
t^2 - 4t - 21 = 0
(t-7)(t+3) = 0

t = 7
y = 210/3 = 70mph = avg speed of the faster one
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 [#permalink] New post 30 Jan 2004, 17:41
E) NONE OF THESE YUP 70 mph
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 [#permalink] New post 30 Jan 2004, 20:19
Hi sunnyboy,

u have already posted a similar Q involving slow and fast trains. Whatsup with this Mars thing? You wanna check if guys have been drinking enough beer for the weekend huh :lol:
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 [#permalink] New post 30 Jan 2004, 20:22
:-D :-D :-D anyway its time for :sleep, Goodnight guys
  [#permalink] 30 Jan 2004, 20:22
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A journey of 210 miles from a rock on Mars to another rock

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