Aparachutist is in free fall at a rate of 200 km/h when he opens his parachute at an altitude of 600 m. following a rapid and constant deceleration, he then descends at a constant rate of 60 km/h from 586 m to 30 m, where he maneuvers the parachute into the wind to further slow his descent. the parachutist lands with a negligible downward velocity.
1. determine the time required for the parachutist to land after opening his parachute.