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Journey

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Manager
Status: It's "Go" Time.......
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Journey [#permalink]  24 Apr 2011, 16:23
00:00

Question Stats:

73% (01:41) correct 26% (02:12) wrong based on 19 sessions
Walking at 5/6 of its usual speed, a train is 10 minutes too late.what is usual time to cover the journey?

A. 70 minutes
B. 2 hours
C. 2/3 hours
D. 5/6 hours
E. 85 minutes
[Reveal] Spoiler: OA

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Senior Manager
Joined: 30 Aug 2009
Posts: 295
Location: India
Concentration: General Management
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Kudos [?]: 65 [0], given: 5

Re: Journey [#permalink]  24 Apr 2011, 16:57
vijayahir wrote:
Walking at 5/6 of its usual speed, a train is 10 minutes too late.what is usual time to cover the journey?

A. 70 minutes
B. 2 hours
C. 2/3 hours
D. 5/6 hours
E. 85 minutes

let Speed be S and Time to cover the journey be T

S * T = D (distance of journey) --- 1

now as per the question stem we have

(5/6)S * (T + 10) = D ----2

Equating Value of D from (1) in (2) we get T = 50mins or 5/6hrs .

Ans D
Manager
Status: It's "Go" Time.......
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Re: Journey [#permalink]  24 Apr 2011, 17:02
Kp you have got the right answer & I would have solved it the same way as you have on gmat but I have got an alternative explanation which will give the answer in around 20-30 sec!!

Let's see what others come up with..I will reveal my alternate approach soon!!
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He who knows when he can fight & when He can't will be victorious.

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Joined: 16 Nov 2010
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Re: Journey [#permalink]  25 Apr 2011, 05:02
5v/6 * (t+10) = vt

5t/6 + 50/6 = t

=> t = 50 min

=> t = 50/60 hrs = 5/6 hrs

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Manager
Status: It's "Go" Time.......
Affiliations: N.C.C.
Joined: 22 Feb 2011
Posts: 182
Location: India
Followers: 5

Kudos [?]: 17 [2] , given: 2

Re: Journey [#permalink]  25 Apr 2011, 11:07
2
KUDOS
It was fairly short Mr. Subhashghosh!

But I approached this question as stated below,

New time must be 6/5 of old time (t) as the speed was reduced to 5/6 of the old speed (s)

Thus,

6/5(t) - t = 10
1/5t=10
t= 50 minutes
_________________

We are twice armed if we fight with faith.

He who knows when he can fight & when He can't will be victorious.

VP
Status: There is always something new !!
Affiliations: PMI,QAI Global,eXampleCG
Joined: 08 May 2009
Posts: 1395
Followers: 8

Kudos [?]: 86 [0], given: 10

Re: Journey [#permalink]  26 May 2011, 00:09
time and speed have inverse ratio's.
meaning 6/5 is the new time.

hence 6/5 t1 - t1 = 10 giving t1 = 50 min = 5/6 hrs.
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Re: Journey   [#permalink] 26 May 2011, 00:09
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