If a plane can travel 490 miles per hour with the wind and 450 miles per hour against the wind, find the speed of the plane without a wind and the speed of the wind.

Acentral angle measuring 160 degrees intercepts an arc in a circle whose radius is 4. what is the length of the arc the circle formed by this central angle? round the length of the arc to the nearest hundredth of a unit. a) 4.19 units b) 6.28 units c) 12.57 units d) 12.57 square units