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In the first hour of a two-hour trip, a car traveled

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Senior Manager
Joined: 30 May 2005
Posts: 274

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In the first hour of a two-hour trip, a car traveled [#permalink]

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17 Jun 2005, 14:21
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In the first hour of a two-hour trip, a car traveled d kilometers, and in the second hour of the trip, the car traveled one-half that distance. What is the average rate at which the car traveled during the trip, in kilometers per hour?
(A) d
(B) 1/3 d
(C) 1/2d
(D)3/4 d
(E) 2/3 d
THANKS

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Manager
Joined: 21 Jun 2004
Posts: 235

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17 Jun 2005, 23:23
avg speed = total distance / total time

= (d + d/2)/2 = 3d/4

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17 Jun 2005, 23:23
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