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Joined: 02 Sep 2009
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55% (01:28) correct 45% (01:48) wrong based on 173 sessions
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Re M0619
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16 Sep 2014, 00:27



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Re: M0619
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01 Aug 2015, 23:00
A very good question. You would just have to draw a straight line and think logically to solve this tricky problem.



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Re: M0619
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27 Feb 2016, 09:35
Could we please expand on this answer, perhaps drawing a line to see how this works? Thank you



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Re: M0619
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31 May 2016, 08:58
VeritasPrepKarishma BunuelAXB Can you please share your thoughts on this problem. I have tried to visualize it this way. Say we have 100m distance between the two points. Now, See Buster has started 20 minutes before but still reaches at the same time that means his time is t + 20 if t is the time taken by charlie to reach 100 meters distance. Now, one thing we know is that : charlie has higher speed than buster. So far so good. But how do we know what happens before they cross, at the time of crossing and after they have crossed is something I need more clarification on. When Charlie starts Buster has already covered a distance equal to 20 times his speed in miles per hour. When charlie and Buster meet at say X point then we have DX more than X Since if both we running at equal speed then starting 20 minutes early they would have met beyond the midpoint of the D. I think, I am getting lost beyond this point. Can you help me get organized from here?



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ankushbagwale wrote: VeritasPrepKarishma BunuelAXB Can you please share your thoughts on this problem. I have tried to visualize it this way. Say we have 100m distance between the two points. Now, See Buster has started 20 minutes before but still reaches at the same time that means his time is t + 20 if t is the time taken by charlie to reach 100 meters distance. Now, one thing we know is that : charlie has higher speed than buster. So far so good. But how do we know what happens before they cross, at the time of crossing and after they have crossed is something I need more clarification on. When Charlie starts Buster has already covered a distance equal to 20 times his speed in miles per hour. When charlie and Buster meet at say X point then we have DX more than X Since if both we running at equal speed then starting 20 minutes early they would have met beyond the midpoint of the D. I think, I am getting lost beyond this point. Can you help me get organized from here? Hi ankushbagwale and Avigano, we are concerned what happens when B reaches half the distance..B takes \(x\) min and C takes \(x20\).... B is at half the distance at \(\frac{x}{2}\)..... so lets see where is C at this time 20 min, as he starts 20 minutes later = \(\frac{x}{2} 20\).. But when does C reach midway = at \(\frac{x20}{2} =\frac{x}{2}  10\) since C reaches half way ONLY at \(\frac{x}{2} 10\), he has to walk for another 10 minutes after \(\frac{x}{2}20\) to reach midway.. so they meet towards the starting point of C..suff
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Re: M0619
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02 Jun 2016, 16:28
Thank you Chetan for your explanation. It all makes sense now. I think, logically also what bunuel said is the correct way. Suppose they were to meet at the middle point. Then in that case C would have reached the destination earlier that B. Suppose they meet at any point before the midpoint and towards B then C would have lesser distance and more rate than B, Hence C still would have reached before B. Thus, the only scenario when Both reaches at the same time is when B has already travelled considerable distance ( at least more than the half ) before C started and then C starts 20 minutes later and covers that at higher rate.



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Re M0619
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14 Jul 2016, 15:40
I think this is a highquality question and I agree with explanation.



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I wasn't satisfied with the explanation given here so i tried to solve it: Smart numbers worked only after doing some attempts as answer used to vary with the distance between b mph and c mph. Let me know if you think i am doing some/anything wrong... PLEASE USE C = 19 NOT 20. as i said, the answer only made sense after a few trials...
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Re: M0619
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06 Jan 2018, 12:56
Is there a better explanation for this question? It looks like a good questions but the explanation is poorly written.



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Re: M0619
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06 Jan 2018, 13:08



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13 Feb 2018, 07:55
Beauty!!!



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Given: Speed of B = B miles per hour Speed of C = C miles per hour and C started the journey after 20 minutes.
from1) C took 55 minutes...not giving us any information regarding time taken by B so we can't compare their speeds, hence not sufficient !
from2) B & C reached at the same time. Let's assume distance D= 100 miles and time taken by B = 100 mins, therefore time taken by C = 80 mins Hence speed of B = 1 mile per min and C =10/8 mile per min C started the journey after 20 mins.....so in 20 mins B covered 20 miles....remaining distance 80 miles Now Relative speed concept They both are travelling in opposite directions so relative speed = 1+10/8 =18/8 miles per min time taken to cover 80 miles with this relative speed = (80/18)*8 = 35.something (this is the time when they cross each other) B already covered 20 miles and in 35.something time s/he will cover = 35 miles total = 55 miles , this means C covered 10055 =45 miles. Hence option B !










