A train crosses two persons who are cycling in the same direction as the train, in 12 seconds and 18 seconds respectively. If the speeds of the two cyclists are 9km/h and 18km/h respectively.Find the length and speed of the train?

Asked by mkp400 | 29th Dec, 2017, 08:31: AM

Expert Answer:

begin mathsize 16px style let space speed space of space train space is space straight x km over hr
so space for space the space person space with space speed space 9 km over hr
total space speed space is space 9 plus straight x
time space is space 12 sec equals 12 over 3600 hrs
so space total space lenght space left parenthesis distance space covered right parenthesis equals open parentheses 9 plus straight x close parentheses open parentheses 12 over 3600 close parentheses
similarly space for space other space guy
so space total space lenght space equals open parentheses 18 plus straight x close parentheses open parentheses 18 over 3600 close parentheses
as space train space is space same space so space do space lengths
open parentheses 9 plus straight x close parentheses open parentheses 12 over 3600 close parentheses equals open parentheses 18 plus straight x close parentheses open parentheses 18 over 3600 close parentheses end style

Answered by Arun | 29th Dec, 2017, 06:17: PM

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