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 Author: Bunuel [ 29 Jan 2021, 09:00 ] Post subject: Excluding stoppages, the speed of a train is 40 km/hand including stop Excluding stoppages, the speed of a train is 40 km/hand including stoppage, it is 32 km/h. For how many minutes does the train stop per hour ?(A) 10(B) 12(C) 15(D) 18(E) 20

 Author: CrackverbalGMAT [ 29 Jan 2021, 09:12 ] Post subject: Re: Excluding stoppages, the speed of a train is 40 km/hand including stop Without stoppage he travels 40 km in 60 minutes. Therefore he travels 1 km every 60/40 = 3/2 minutesWith stoppage he travels 32 km in 1 hour.To travel 32 km, he requires 32 * (3/2) = 48 minutesTherefore his stoppage time is 60 - 48 = 12 minutesOption BArun Kumar

Author:  meanup [ 29 Jan 2021, 10:00 ]
Post subject:  Excluding stoppages, the speed of a train is 40 km/hand including stop

$$\frac{S_{excluding}}{S_{including}}=\frac{40}{32}=\frac{5}{4}$$

$$\frac{T_{excluding}}{T_{including}} = \frac{4}{5}$$

Refer to the image for more information.

Ans B

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 Author: Nik11 [ 13 Mar 2021, 00:25 ] Post subject: Re: Excluding stoppages, the speed of a train is 40 km/hand including stop Bunuel wrote:Excluding stoppages, the speed of a train is 40 km/hand including stoppage, it is 32 km/h. For how many minutes does the train stop per hour ?(A) 10(B) 12(C) 15(D) 18(E) 20I got the point of the above-mentioned methods, but I offer an alternative from my point of view much more intuitive.LCM for a smart distance ----> 160kmAt 40 km/h this distance is covered in 4 hoursAt 32 km/h is covered in 5 hoursGood 1 hour of difference, hence (1/5) * 60 min is time per min spent in stoppages ---> 12 minutes

 Author: bumpbot [ 28 Jun 2022, 13:39 ] Post subject: Re: Excluding stoppages, the speed of a train is 40 km/hand including stop Hello from the GMAT Club BumpBot!Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.

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