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piyush rajput

· started a discussion

· 1 Months ago

doubt about finding the speed (Question: 101206.0 )

as from the ques 120 is the length of each train. and there is no mention of length of post that the trains have been crossing in the given time.. s=d/t where d is the distance traveled or cross in given time to calculate the speed.. a post have 0(km or mile or meter ) so who u have take 120 as d for finding speed.. the later part d=120 is ok for relative speed.

Question:

Two trains of equal length take 10 seconds and 15 seconds respectively to cross a telegraph post. If the length of each train be 120 metres, in what time (in seconds) will they cross each other travelling in opposite direction?

Options:
A) 16
B) 15
C) 12
D) 10
E) None of these
Solution:

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