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30 Jan 2004, 18:01
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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. :ninja :fu
e. none of these
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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30 Jan 2004, 18:16
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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
(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
30 Jan 2004, 18:41
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E) NONE OF THESE YUP 70 mph
