Madhya Pradesh Police Exam Model Paper 10

Given:
Length of train A = 60 m
Length of train B = 40 m
Time taken to cross each other = 10 seconds
Formula used:
Speed = Distance/Time
Calculation:
Let the speed of both train is x m/s
Relative speed = (x + x)km/h = 2x m/s
Now,
Time $=\left(60+40\right)/\left(2\mathit{x}\right)$
$\Rightarrow 10=100/2\mathit{x}$
$\Rightarrow 2\mathit{x}=10$
$\Rightarrow \mathit{x}=5$ m/s
$\Rightarrow \mathit{x}=18$ km/h [1 m/s = 18/5 km/h]