Question

the two trains moving in opposite directions on parallel rails at 40km /hr and 35km /hr Cross each other in 18 seconds if the length of one train is 205 m find the length of the other​

Answer 1

$\bold\pink{AnSwer=170\:meter}$

EXPLANATION :

Given:

• Speed of first train s1 = 40km/h
• Speed of second train s2 = 35km/h
• Length of first train = 205 meter
• Time of crossing = 18 seconds

$\bold\green{Let,}$

1. First train be T1
2. Second train be T2
3. Length of second train be x

$\underbrace{relative\:speed}$ = s1+s2

= 40m+35m

=75m

$\underbrace{Total\:distance}$ = length of T1 + length of T2

= (205+x)m

$\underbrace{Time}$ = 18 seconds

$speed = \frac{distance}{time} \\ distance = speed \times time$

$205 + x = \frac{75 \times 5}{18} \times 18 \\ 205 + x = 375 \\ x = 375 - 205 \\ x = 170m$

$\large\underline\blue{length\:of\:second\:train=170\:meter}$