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uma maheswari.R

· started a discussion

· 1 Months ago

is the relative speed right? (Question: 259933.0 )

i think relative speed should be (40+80) *(5/18) m/s

Question:

An express train travelling at 80 kmph overtakes a goods train twice as long and going at 40 kmph on a parallel track, in 54 seconds. How long will the express train take to cross a station 400 m long?

Options:
A)

36 second

B)

45 second

C)

27 second

D)

81 second

Solution:

Ans: (c)

  

Knowledge Expert

· commented

· 1 Months ago

Dear Student,
When trains travel in same direction , we subtract to obtain relative speed.

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