Madhya Pradesh Police Exam Model Paper 5

Tips & Tricks
Given
The ratio of speed of two trains A and B = 3 : 4.
Formula
Time = Distance/Speed
Calculation
Let the speed of train A and B be 3x and 4x.
Time taken by train A to cover 480 km - Time taken by train B to cover 480 km = 2
$\Rightarrow 480/3\mathit{x}-480/4\mathit{x}=2$
$\Rightarrow 480/12\mathit{x}=2$
$\Rightarrow 40/\mathit{x}=2$
$\Rightarrow \mathit{x}=20$
∴ Speed of train A = 3x = 3 × 20 = 60 km/h