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Excluding stoppages, the speed of a train is 40 km/hand including stop https://gmatclub.com/forum/excludingstoppagesthespeedofatrainis40kmhandincludingstop347283.html 
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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 minutes With stoppage he travels 32 km in 1 hour. To travel 32 km, he requires 32 * (3/2) = 48 minutes Therefore his stoppage time is 60  48 = 12 minutes Option B Arun 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

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) 20 I got the point of the abovementioned methods, but I offer an alternative from my point of view much more intuitive. LCM for a smart distance > 160km At 40 km/h this distance is covered in 4 hours At 32 km/h is covered in 5 hours Good 1 hour of difference, hence (1/5) * 60 min is time per min spent in stoppages > 12 minutes 
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Post subject:  Re: Excluding stoppages, the speed of a train is 40 km/hand including stop 
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