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

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Senior Manager
Joined: 30 Aug 2003
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A journey of 210 miles from a rock on Mars to another rock [#permalink]  30 Jan 2004, 17:01
A journey of 210 miles from a rock on Mars to another rock on Mars 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.
e. none of these
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Manager
Joined: 25 Jan 2004
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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
Manager
Joined: 26 Dec 2003
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E) NONE OF THESE YUP 70 mph
SVP
Joined: 30 Oct 2003
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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
Manager
Joined: 26 Dec 2003
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anyway its time for , Goodnight guys
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