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A car travels from point A to point B. The average speed of [#permalink]
26 Jul 2010, 21:46

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Difficulty:

45% (medium)

Question Stats:

66% (02:39) correct
34% (01:28) wrong based on 304 sessions

A car travels from point A to point B. The average speed of the car is 60 miles/hr and it travels the first half of the trip at a speed of 90 mi/hr. What is the speed of the car in the second half of the trip?

But there’s something in me that just keeps going on. I think it has something to do with tomorrow, that there is always one, and that everything can change when it comes. http://aimingformba.blogspot.com

Re: distance problem [#permalink]
26 Jul 2010, 22:08

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A car travels from point A to point B. The average speed of the car is 60 miles/hr and it travels the first half of the trip at a speed of 90 mi/hr. What is the speed of the car in the second half of the trip?

A. 30 B. 45 C. 60 D. 75 E. 90

Let the average speed for the second half of the trip be x miles per hour.

Pick some smart number for the distance from A to B: let the distance be 180 miles, so half of the distance will be 90 miles.

Re: A car travels from point A to point B. The average speed of [#permalink]
27 Nov 2012, 02:28

1

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how about weighted average for this method? the number between 90 and 60 is 30. So it should be slightly higher than 30 and less than 60. So the ans is 45 _________________

I've failed over and over and over again in my life and that is why I succeed--Michael Jordan Kudos drives a person to better himself every single time. So Pls give it generously Wont give up till i hit a 700+

Re: A car travels from point A to point B. The average speed of [#permalink]
18 Aug 2013, 19:12

1

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Let distance be D. Half distance travelled at avg speed of 90m/h. Let x m/h be the avg speed for seconds half of the distance. Given : Avg speed for the entire trip is 60

D/2/90 + D/2/x = D/60 D/180 + D/2x = D/60 Solving for x, we get 45m/h

Re: A car travels from point A to point B. The average speed of [#permalink]
13 Feb 2014, 06:05

1. Use 180 for each half distance, therefore total distance is 360 2. Total distance / Avg Speed = Total Time---> 360/60 = 60 3. Total time in first leg = 180/90 = 2 hrs 4. Avg speed in second leg= 180/4=45

Re: A car travels from point A to point B. The average speed of [#permalink]
26 Jun 2014, 02:45

aiming4mba wrote:

A car travels from point A to point B. The average speed of the car is 60 miles/hr and it travels the first half of the trip at a speed of 90 mi/hr. What is the speed of the car in the second half of the trip?

A. 30 B. 45 C. 60 D. 75 E. 90

VERY EASY USE THE FORMULA FOR EQUAL DISTANCE TRAVELLED OR HALF DISTANCE

AVERAGE SPEED = 2AB/A+B, WHERE A AND B ARE THE SPEEDS OF THE CAR IN FIRST HALF DISTANCE AND SECOND HALF DISTANCE RESP.

FOR THREE EQUAL DISTANCE USE AVG SPEED = 3ABC/A+B+C ==== SAME AS A,B,C ARE SPPED RESP

Re: A car travels from point A to point B. The average speed of [#permalink]
06 Sep 2014, 10:49

I am wondering... so "half the trip" refers to distance or to time? If "half the trip" means half of the distance, the answer is 45. If "half the trip" means half of the total time, the answer is 30.