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EMF induction

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A constant magnetic field passes through a single rectangular loop whose dimensions are 0.35 m x 0.55 m. The magnetic field has a magnitude of 2.1 T and is inclined at an angle of 70° with respect to the normal to the plane of the loop.

(a) If the magnetic field decreases to zero in a time of 0.52 s, what is the magnitude of the average emf induced in the loop?
Answer is in V
(b) If the magnetic field remains constant at its initial value of 2.1 T, what is the magnitude of the rate A / t at which the area should change so that the average emf has the same magnitude as in part (a)?
Answer is in m^2/s

I am completely lost

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