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It took the bus 4 hours to get from town A to town B. What

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It took the bus 4 hours to get from town A to town B. What [#permalink] New post 23 May 2008, 00:48
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It took the bus 4 hours to get from town A to town B. What was the average speed of the bus for the trip?

1.In the first 2 hours the bus covered 100 miles
2.The average speed of the bus for the first half of the distance was twice its speed for the second half

Sorry, may I ask this question that I always confused when facing: for statement2 :fist speed = 2 second speed OR 2 first speed = second speed. Thanks!
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Re: M16.8 [#permalink] New post 23 May 2008, 04:39
sondenso wrote:
It took the bus 4 hours to get from town A to town B. What was the average speed of the bus for the trip?

1.In the first 2 hours the bus covered 100 miles
2.The average speed of the bus for the first half of the distance was twice its speed for the second half

Sorry, may I ask this question that I always confused when facing: for statement2 :fist speed = 2 second speed OR 2 first speed = second speed. Thanks!


I got the answer - E

1st stmnt alone => not sufficient - since it does not talk about disstance covered in last 2 hrs.
2nd stmnt alone => not sufficient - since it does not give distance and total time. We can still find the avg speed in terms of 'x' from this, where x = avg speed in second half of the travel
Both stmnt together => not sufficient - since 1. talks about first half in terms of time and 2. talks about 1st half in terms of distance.

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Re: M16.8 [#permalink] New post 23 May 2008, 10:30
cant we use the rate formula? D=R*T

1st half of trip
100=R*2Hours

R=50

2nd half of trip we know was 1/2 the rate of the first half

D=1/2 *50 * 2hours

D=50

total distance traveled is 150
Total hours is 4

150/4 = avg speed
am i totally wrong?
Re: M16.8   [#permalink] 23 May 2008, 10:30
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