Rohit is in seat number 48 of train moving with a speed of 18 km/h and Deepa is standing on the platform .Then (1)
A: Rohit is at rest according to another passenger in the train.
B: Deepa is moving according to Rohit.
C: Rohit is moving according to Deepa.
D: Rohit is moving according to the train.
Then the incorrect options are-
(a) A, D (c) B, C
(b) B, D (d) Only D
plzz answer it's very urgent....
Answers
Answer:
Explanation:
Speed of train 1 = 48 kmph
Let the length of train 1 = 2x meter
Speed of train 2 = 42 kmph
Length of train 2 = x meter (because it is half of train 1's length)
Distance = 2x + x = 3x
Relative speed= 48+42 = 90 kmph = (90*5/18) m/s = 25 m/s
Time = 12 s
Distance/time = speed
=>3x/12 = 25 (25*12)/3
Length of the first train = 2x = 200 meter
Time taken to cross the platform= 45 s
Speed of train 1 = 48 kmph = 480/36 = 40/3 m/s
Distance = 200 + y [where y is the length of the platform]
x =100m => 200+y = 45* 40/3
y = 400m
Subject: Problems on Trains - Quantitative Aptitude - Arithmetic Ability
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