P(blue) someone plz help me

What is the volume of a rectangular prism if the length is 10.4 mm the width is 5 mm in the height is 8 mm

Lizette is training for a marathon. at 7: 00 she left her house and ran until 8: 30, then she walked until 11: 30. she covered a total distance of 18 miles. her running speed was six miles per hour faster than her walking speed. find her running and walking speeds in miles per hour.

Which answer choice is it? is it the first ,second,third or fourth giving 40 points for whoever answers correctly you