Question
CIVICS > ELECTION_COMMISSION
1) Find the length of the platform which a train 400 m long, travelling at 45 km/hour, can cross in 40 seconds
A) 100 mB) 110 m
C) 120 mD) 150 m
View Answer        RRB Se Exam 2014 yellow colour
Answer : 100 m

egin{aligned}\ ext{Length of train L1 = 400 m}\ ext{Time T = 45 }frac{km}{hr}\ frac{45*5}{18}=frac{left( L + 400 ight)}{40}\ frac{ 45 * 5 * 40}{18}=L+400\ ext{500 - 400 = L}\ ext{L = 100} end{aligned}



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