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Excluding stoppages, the speed of a train is 40 km/hand including stop
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Bunuel
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Excluding stoppages, the speed of a train is 40 km/hand including stop [#permalink] New post  29 Jan 2021, 09:00
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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
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Re: Excluding stoppages, the speed of a train is 40 km/hand including stop [#permalink] New post  29 Jan 2021, 09:12
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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

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meanup
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Excluding stoppages, the speed of a train is 40 km/hand including stop [#permalink] New post  29 Jan 2021, 10:00
\(\frac{S_{excluding}}{S_{including}}=\frac{40}{32}=\frac{5}{4}\)

\(\frac{T_{excluding}}{T_{including}} = \frac{4}{5}\)

Refer to the image for more information.

Ans B
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