Time for the satellite to circle the Earth once - Orbital dynamics question

If a satellite orbits the Eath with an orbital radius of 7.50x10^6 m determine the

a) satellite's orbital speed
Got this part - 7292.60813 m/s

NEED HELP ON THIS PART:

b) time for the satellite to circle the Earth once
don't understand how to get this part... the answer is 108 minutes

I just need the base formula for how to get this answer

Equ.for centripetal accel.= V²/R
Accel. due to grav. at satellite .. g(s) = Fs/Ms = (G*Me*Ms/R²) / Ms = G*Me/R²

Equating acceleration expressions
V²/R = G*Me/R²
V² = G*Me/R

b)Orbit time = circumference (distance) / velocity
, T = 2πR / V