We need to know the speed at which Sonya walks. An average adult walks at about 5 kilometers an hour, but you did not give us all the information on Sonya.
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5530/790=7 hours
5hours
time =distance divided by speed time = 4700/790 = 5.95 hours = 5 hours 57 minutes
TIME = DISTANCE divided by SPEED TIME (hours) = DISTANCE (km) divided by SPEED (km/h) TIME = 9KM divided by 6KM/H TIME = 1.5 Hours or 90 minutes
Time = Distance/Speed = 6000/80 = 75 hours. That assumes that you can drive 75 hours averaging that speed without a break!