Question

Two trains 120m and 100 m in length are running in opposite directions with velocityes 42 km h¹ and 30 km h¹ In what time they will completely cross each other ?​

Answer 1

$\huge\bold{\textbf{\textsf{{\color{cyan}{kya \: hogya \: ?\:}}}}}$

(,,Ծ‸Ծ,,)

∴ Relative velocity of car ,

$Ae. r .t. B$

$vAB=40−60= \frac{ - 20km}{h} ,Separationo$

⇒ Total distance to be trvelled by each tain to cross othe train ,

$120 + 100 = 220m$

⇒ Time taken by each train to cross other train ,

$t = \frac{220}{20} = 11s$