Faraday's law - magnitude of induced emf (average)

The rectangular loop shown below moves into a region of uniform magnetic field at a speed of $v=2.5{\displaystyle \frac{\text{cm}}{\text{s}}}$‍.

The dimensions of the rectangle are $l=10\text{cm}$‍ and $b=40\text{cm}$‍. The magnitude of the field is $B=0.6\text{T}$‍.

$|{\epsilon }_{\text{avg}}|=$‍ $\times {10}^{-3}\text{V}$‍