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A motorcyclist has to cover a distance of 200 km to reach

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A motorcyclist has to cover a distance of 200 km to reach [#permalink] New post 16 Aug 2011, 17:46
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A motorcyclist has to cover a distance of 200 km to reach city B from city A. After travelling a certain distance, his motorcycle develops a problem and travels at 3/4th of its original speed, there by he reached B 1 hour late. Had the problem developed 30 KM earlier, he would have reached b 12 mins later. Find the the initial distance traveled without the problem and the speed over that part of the journey.

A. 50KM,60KM
B. 40KM, 40KM
C. 60KM, 30KM
D. 50KM, 50 KM
E. 60KM 60KM
[Reveal] Spoiler: OA

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Re: time and distance question #8 [#permalink] New post 16 Aug 2011, 20:43
cleetus wrote:
A motorcyclist has to cover a distance of 200 km to reach city B from city A. After travelling a certain distance, his motorcycle develops a problem and travels at 3/4th of its original speed, there by he reached B 1 hour late. Had the problem developed 30 KM earlier, he would have reached b 12 mins later. Find the the initial distance traveled without the problem and the speed over that part of the journey.

A) 50KM,60KM
B) 40KM, 40KM
C)60KM, 30KM
D)50KM, 50 KM
E) 60KM 60KM


This is beyond GMAT because it is more laborious and less logical.

Let the initial breakdown occurred at x km
Let the initial speed be v km/h

\frac{x}{v}+\frac{200-x}{\frac{3}{4}v}=\frac{200}{v}+1 ------------------1

\frac{x-30}{v}+\frac{200-(x-30)}{\frac{3}{4}v}=\frac{200}{v}+1+\frac{1}{5} ------------------2

Solve these equations to get x and v.

Ans: "D"
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Re: time and distance question #8 [#permalink] New post 17 Aug 2011, 05:39
um so happy to read it's beyond GMAT...wish n hope such ques nvr cum
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Re: time and distance question #8 [#permalink] New post 25 Aug 2012, 11:01
A motorcyclist has to cover a distance of 200 km to reach city B from city A. After travelling a certain distance, his motorcycle develops a problem and travels at 3/4th of its original speed, there by he reached B 1 hour late. Had the problem developed 30 KM earlier, he would have reached b 12 mins later. Find the the initial distance traveled without the problem and the speed over that part of the journey.

we can use options to solve this poblem.

D) 50 KM , 50 KM

Ist part says if he travels 3/4 th of original speed he reaches 1 hour late.

3/4 th speed of 50 = 37.5

if 50 KM is already covered as in option, total time taken at reduced speed to cover remaining distance.

150 / 37.5 = 4
total time = 4 + 1 = 5

and if he has travelled at original speed , time taken
= 200/ 50 = 4

Thus, the difference = 1 hour. In all the remaining case the difference of time is not 1 hour.

Answer D.
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Re: time and distance question #8 [#permalink] New post 25 Aug 2012, 11:58
fluke wrote:
cleetus wrote:
A motorcyclist has to cover a distance of 200 km to reach city B from city A. After travelling a certain distance, his motorcycle develops a problem and travels at 3/4th of its original speed, there by he reached B 1 hour late. Had the problem developed 30 KM earlier, he would have reached b 12 mins later. Find the the initial distance traveled without the problem and the speed over that part of the journey.

A) 50KM,60KM
B) 40KM, 40KM
C)60KM, 30KM
D)50KM, 50 KM
E) 60KM 60KM


This is beyond GMAT because it is more laborious and less logical.

Let the initial breakdown occurred at x km
Let the initial speed be v km/h

\frac{x}{v}+\frac{200-x}{\frac{3}{4}v}=\frac{200}{v}+1 ------------------1

\frac{x-30}{v}+\frac{200-(x-30)}{\frac{3}{4}v}=\frac{200}{v}+1+\frac{1}{5} ------------------2

Solve these equations to get x and v.

Ans: "D"


This is the advantage of multiple choice questions...:o)

The first equation gives 3v+x=200. The second equation boils down to 18v+5x=1150.
You can try to pick the correct answer based on the first equation and even before you work out the second equation. They can't be so mean to provide more than one solution which fulfill the first equation. Or let's hope...:o)
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Re: A motorcyclist has to cover a distance of 200 km to reach [#permalink] New post 27 Aug 2012, 07:28
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Why not solve this problem in different way ?

Distance................: A...............................................B
Velocity..................: V...............l....3V/4..................... (this takes +1 hr)
If 30 KM before......: V.........l..........3V/4............................ (this takes +1 hr + 12 minutes)

So, we can deduce that as the cyclist lowered the speed from V to 3V/4 to cover 30 KM, he tool 12 minutes more time.

So, forming equation to find the difference of time we get we get

30*4/3V - 30/V = 12
=> 40/V - 30/V=12
=> 10/V=12
=> V=10 KM/12 Minutes
=> V=50 KM/Hr

Only option D has this value. So, it is the right answer
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Re: A motorcyclist has to cover a distance of 200 km to reach [#permalink] New post 26 Nov 2013, 11:52
cleetus wrote:
A motorcyclist has to cover a distance of 200 km to reach city B from city A. After travelling a certain distance, his motorcycle develops a problem and travels at 3/4th of its original speed, there by he reached B 1 hour late. Had the problem developed 30 KM earlier, he would have reached b 12 mins later. Find the the initial distance traveled without the problem and the speed over that part of the journey.

A. 50KM,60KM
B. 40KM, 40KM
C. 60KM, 30KM
D. 50KM, 50 KM
E. 60KM 60KM


This is not GMAT material
Cheers
J :)
Re: A motorcyclist has to cover a distance of 200 km to reach   [#permalink] 26 Nov 2013, 11:52
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