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

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

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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) 1/2*d
(D) 3/4*d
(E) 3/2*d
[Reveal] Spoiler: OA

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

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New post 12 Nov 2015, 02:39
1st hour , distance travelled by car = d km
2nd hour , distance travelled by car = d/2 km

Average speed = Total distance/Time
= (d + d/2)/2 = 3/4 d

Answer D

We can also solve this using weighted average concept .
As the time for both the legs is same , the speed will be the average of the speed for first hour and second hour .
That is average of d and d/2 = 3/4 d
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Re: In the first hour of a two-hour trip, a car traveled d kilometers, and [#permalink]

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New post 12 Nov 2015, 02:51
1st half =d
2nd half=d/2
total distance 3d/2
avg rate =3d/2/2 =3d/4

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Re: In the first hour of a two-hour trip, a car traveled d kilometers, and [#permalink]

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New post 12 Nov 2015, 06:49
Bunuel wrote:
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) 1/2*d
(D) 3/4*d
(E) 3/2*d


Let, Car travelled (d=)2 km in first hour
i.e. Car travelled (1/2)*2=1 km in Second hour

Total Distance Travelled = 2+1 = 3
Total Time = 2 Hours

Average Speed = Total Distance / Total Time = 3/2 --------[for d=2]

Check Options

Answer: option D
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Re: In the first hour of a two-hour trip, a car traveled d kilometers, and [#permalink]

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New post 14 Nov 2015, 03:02
Bunuel wrote:
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) 1/2*d
(D) 3/4*d
(E) 3/2*d



Solution:

Lets look at the information given in the question...

Total time travelled = 2 hrs
Distance travelled first hour = d
Distance travelled second hour = d/2

The question is asking for the avg speed at which the car travels for 2 hrs

We know that avg speed = total distance/total time

Lets place the information given in the question to the formula above = (d+d/2)/2
= 3/4*d

We find that option D is the answer as it gives the same expression as found in our calculation above. Answer option D.

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Re: In the first hour of a two-hour trip, a car traveled d kilometers, and [#permalink]

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Re: In the first hour of a two-hour trip, a car traveled d kilometers, and   [#permalink] 27 Sep 2017, 11:34
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