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20 Mar 2016, 09:48
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
65%
(hard)
Question Stats:
66% (02:46) correct
34%
(02:51)
wrong
based on 407
sessions
History
Date
Time
Result
Not Attempted Yet
Two trains for Mumbai leave Delhi at 6 am and 6.45 am and travel at 100 kmph and 136 kmph respectively. How many kilometers from Delhi will the two trains be together.
A. 260 km
B. 262.4 km
C. 275 km
D. 283.33 km
E. 300 km
A. 260 km
B. 262.4 km
C. 275 km
D. 283.33 km
E. 300 km
20 Mar 2016, 10:42
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In the first 45 minutes, train A is able to travel 100 kmh * (3/4) h = 75 km.
The relative speed of the second train to the first train is 36 kmh. Thus we need to find the time that the second train will take to cover that distance:
D = s*t
75 = 36kmh * t ==> t = 75/36 h
Now we need to find the distance traveled in that amount of time:
D = s*t
D = 136kmh * (75/36)h
D = 283.33 km
Answer: D
The relative speed of the second train to the first train is 36 kmh. Thus we need to find the time that the second train will take to cover that distance:
D = s*t
75 = 36kmh * t ==> t = 75/36 h
Now we need to find the distance traveled in that amount of time:
D = s*t
D = 136kmh * (75/36)h
D = 283.33 km
Answer: D
General Discussion
27 Aug 2018, 11:04
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I know this is probably a stupid objection to say. But according to me, we cannot tell when they will be together if at all. What if in 45 mins, train A has already reached Mumbai. We don't know the distance between Delhi and Mumbai do we?
