More Algebra Question! Include Velocity

Algebra Level pending

One day Mike walk with his other friends Jack,Zone and Vanessa to the Park

After reaching Park;All seperate into each direction ;Mike walk with the speed of 4km/h ;Jack walk with the speed of twice more than 2 km/h of Mike ;Zone walk with the speed of Mike and Jack combined together divide by 2 ;Vanessa walk with the speed of (Zone's speed minus with Mike Speed)*2 They all reaching destination in 2 hours What is the Velocity of Vanessa?

(Solution will be Appreciated)(* mean times)

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