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Speed Distance

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Speed Distance [#permalink] New post 19 Sep 2011, 08:27
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A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

67% (02:05) correct 33% (01:02) wrong based on 15 sessions
Three runners A,B and C run a race, with runner A finishing 12m ahead of runner B and 18m ahead of runner C, while runner B finishes 8m ahead of runner C. Each runner travels entire distance at a constant speed. What was the length of the race?

A. 36m
B. 48m
C. 60m
D. 72m
E. 84m
[Reveal] Spoiler: OA

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Re: Speed Distance [#permalink] New post 19 Sep 2011, 09:34
Let distance of race be x mtrs. Then when A finishes x m , B has run (x- 12)mtrs and C has run x-18 mtrs. so at this point B is 6 m ahead of C. Now to finish race b needs to run another 12 m, so he runs another 12 m. when B finishes race he is 8 m ahead of C. so last 12 m B has run, C has run 10 m.

as speeds are constant, we have equation,

x-12/ x-18 = 12/10 > x = 48.

Answer B
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Re: Speed Distance [#permalink] New post 20 Sep 2011, 02:12
Can someone better explain this?
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Re: Speed Distance [#permalink] New post 20 Sep 2011, 02:34
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jamifahad wrote:
Three runners A,B and C run a race, with runner A finishing 12m ahead of runner B and 18m ahead of runner C, while runner B finishes 8m ahead of runner C. Each runner travels entire distance at a constant speed. What was the length of the race?

A. 36m
B. 48m
C. 60m
D. 72m
E. 84m


See if you can logically deduce the answer:
This is what happens in the race.

..._________C___(6)___B_______(12)________A (Finishing Point)

..._____________________C_______(8)______B (Finishing Point)

Focus on B and C.
B and C had a distance of 6 m between them. When B finished the race by covering another 12 m, he created a gap of 8 m between them i.e. he created another 2 m gap while running 12 m.
Since he created a gap of 2 m by running 12 m, he must have created a gap of 8 m by running a total of 12*4 = 48 m

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Re: Speed Distance [#permalink] New post 20 Sep 2011, 02:42
jamifahad wrote:
Three runners A,B and C run a race, with runner A finishing 12m ahead of runner B and 18m ahead of runner C, while runner B finishes 8m ahead of runner C. Each runner travels entire distance at a constant speed. What was the length of the race?

A. 36m
B. 48m
C. 60m
D. 72m
E. 84m



|---------------------------L-------------------|L=Length of the track
|-----------------------------C------B----------|A
|------------------------------------|<--12---->| A finishes 12 m ahead of B
|-----------------------------|<------18------->| A finishes 18 m ahead of C
|-----------------------------|<-6->|---------->| So, B was 6 meters ahead of C when A finished the race ------------1

|----------------------------------------C------|B
|----------------------------------------|<-8-->| B finishes 8 meter ahead of C--------------2


From 1 and 2, we can deduce that
B ran a distance of "L-12" meters taking a lead of 6 meters on C.

L-12->6
1 meter-> 6/(L-12) {:This is the per meter lead by B on C}

For the entire race of L meters, the lead would be
L meters->L*6/(L-12)

And we know the final lead was 8 meters
So,

6L/(L-12)=8
3L/(L-12)=4
3L=4L-48
L=48m

Ans: "B"

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Re: Speed Distance [#permalink] New post 13 Oct 2011, 09:53
Karishma,

can you pls xplain this part

Quote:
Since he created a gap of 2 m by running 12 m, he must have created a gap of 8 m by running a total of 12*4 = 48 m


Im nt able to logically deduce how we got the length of the race?

c ----b -----A(finishes)
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Re: Speed Distance [#permalink] New post 14 Oct 2011, 06:09
Expert's post
shankar245 wrote:
Karishma,

can you pls xplain this part

Quote:
Since he created a gap of 2 m by running 12 m, he must have created a gap of 8 m by running a total of 12*4 = 48 m


Im nt able to logically deduce how we got the length of the race?

c ----b -----A(finishes)



Think of the logic this way:

There are 2 people P and Q.
They both start running simultaneously at different but uniform speeds.
In the time P has covered 2 m, Q has covered only 1 m. What will be the distance between them by the time P covers a total of 4 m? P and Q are running at uniform speeds. Since P created a gap of 1 m in every 2 m he ran, the gap between them must be 2 m now.

Now imagine that P is standing ahead of Q by 6 m. They both start running. What happens by the time P covers 2 m? What is the gap between them? It must be 7 m now since another 1 m gap would have got created.

The logic used here is exactly the same.

B and C had a distance of 6 m between them at one point in time. B covered another 12 m and now the distance between them is 8 m. So basically a gap of 2 m was created by B when he ran 12 m. Overall, at the end of the race, the gap between B and C is 8 m. How much must B have run to create a gap of 8 m ( = 4*2)? He must have run 4*12 = 48 m

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Re: Speed Distance   [#permalink] 14 Oct 2011, 06:09
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