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If a passenger seated by the window on a train moving at 40 km/h observed that an oncoming train took 3 seconds to pass him, how fast was the oncoming train moving if it was 75 meters long?
A. 50 kmh
B. 52 kmh
C. 56 kmh
D. 60 kmh
E. 70 kmh
M11-03
A. 50 kmh
B. 52 kmh
C. 56 kmh
D. 60 kmh
E. 70 kmh
M11-03
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12 Feb 2018, 23:18
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If a passenger seated by the window on a train moving at 40 km/h observed that an oncoming train took 3 seconds to pass him, how fast was the oncoming train moving if it was 75 meters long?
A. 50 kmh
B. 52 kmh
C. 56 kmh
D. 60 kmh
E. 70 kmh
Let's represent the speed of the oncoming train as \(v\). Relative to the passenger, its speed would be \(v + 40\) km/h. If it covers 75 meters in 3 seconds, that's equivalent to 25 meters in 1 second. This speed is equal to \(\frac{25 * 3,600}{1,000} = 90\) km/h (multiplying by 3,600 to get speed in hours and dividing by 1,000 to convert meters into kilometers). Therefore, \(v + 40 = 90\), which gives \(v = 50\) km/h.
Answer: A
A. 50 kmh
B. 52 kmh
C. 56 kmh
D. 60 kmh
E. 70 kmh
Let's represent the speed of the oncoming train as \(v\). Relative to the passenger, its speed would be \(v + 40\) km/h. If it covers 75 meters in 3 seconds, that's equivalent to 25 meters in 1 second. This speed is equal to \(\frac{25 * 3,600}{1,000} = 90\) km/h (multiplying by 3,600 to get speed in hours and dividing by 1,000 to convert meters into kilometers). Therefore, \(v + 40 = 90\), which gives \(v = 50\) km/h.
Answer: A
General Discussion
13 Jul 2011, 11:45
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Galiya
Hi all!
could you help me please with such kind of problem
A passenger sitting near the window in a train moving at 40 km/h, noticed that it took 3 sec. for the oncoming train to pass by. What was the speed of the oncoming train if the length of the oncoming train was 75 metres?
a)50km/h
b)52km/h
c)56km/h
d)60km/h
e)70km/h
could you help me please with such kind of problem
A passenger sitting near the window in a train moving at 40 km/h, noticed that it took 3 sec. for the oncoming train to pass by. What was the speed of the oncoming train if the length of the oncoming train was 75 metres?
a)50km/h
b)52km/h
c)56km/h
d)60km/h
e)70km/h
Ru sure its C?
im getting A
3 secs to pass a 75 mts train , therefore speed = 25 meters/sec
to convert m/s to km/hrs multiply by 3.6
25*3.6 = 90
so its 90-40 = 50 .
