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Suppose a train passes two cars moving in the direction at 45km/hr and 50km/hr in 36 sec and 54 sec respectively. What is the length of the train?

Answer:

train crossed the car with less speed in less time and the car with high speed in more time.i.e train and two cars going in the same direction.
hence 1st car
L/((S-45)*5/18)=36 i.e L=10S-450
similarly for 2nd car
L=15S-750
BY solving these two equations we get length of the train L=150mtrs

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In each questions below are given two statements followed by two conclusionsnumbered I and II. You have to take the given two statements to be true even if they seem to be at variance from commonly known facts. read the conclusion and then decide which of the given conclusions logically follows from the two given statements, disregarding commonly known facts.
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D) All Follow
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II. Some hats are trees
III. All hats are buses
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C) Only II , III and IV follow.
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blue - green
green - yellow
yellow - red
red - violet
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