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28 Apr 2021, 03:45
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A
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A train running at the rate of 40 km/h passes a man riding parallel to the railway line in the same direction at 25 km/h in 48 sec. Find the length of the train in metres.
(A) 200 m
(B) 150 m
(C) 100 m
(D) 50 m
(E) 10 m
(A) 200 m
(B) 150 m
(C) 100 m
(D) 50 m
(E) 10 m
28 Apr 2021, 04:07
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I took relative speed (40 - 25 =15) as the speed and time as 48sec. Using d = speed x time got 200m as answer
(A)
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(A)
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28 Apr 2021, 04:12
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Speed Time Distance question, where we are looking to solve the distance, therefore the formula needed is:
Distance = Speed*Time
Relative speed between the train and the bike is 40 - 25 = 15 km/h
Time it took was 48 seconds
Looking at the answer choices and the time it took for the length to be covered, it is best to convert the speed into m/s
1km/1hour = 1000m/3600s
5m/18s
15km/h in m/s = 15*(5/18)
75/18
Speed*Time = Distance:
75/18 * 48
75/3 * 8
200
Answer A.
Distance = Speed*Time
Relative speed between the train and the bike is 40 - 25 = 15 km/h
Time it took was 48 seconds
Looking at the answer choices and the time it took for the length to be covered, it is best to convert the speed into m/s
1km/1hour = 1000m/3600s
5m/18s
15km/h in m/s = 15*(5/18)
75/18
Speed*Time = Distance:
75/18 * 48
75/3 * 8
200
Answer A.
