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SHYAM LAL

· started a discussion

· 1 Months ago

Mistake in answer (Question: 122048.0 )

Kindly give equal to before 54 KM Per hour in the solution

Question:

A man is standing on a 180 m long bridge. He finds that a train crosses the bridge in 20 sec and it crosses him in 8 sec. Find the length and speed of the train.

Options:
A) 100 m , 45 km/h
B) 105 m , 48 km/h
C)

125 m , 60 km/h


D)

150 m , 50 km/h


E) 120 m , 54 km/h
Solution:
Ans: (e) Length of bridge= 180 m Taken time = 12 sec

Speed of train = \(\cfrac{180}{12}\) = 15 m/sec

= \(\cfrac{15}{5}\) x 18=54 km/h

Time taken to cross the man = 8 sec

Length of train = 15 x 8 = 120 m

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