Janet is rolling a number cube with the numbers 1-6. She records the number after each roll. If she rolls the cube 48 times, how many times should she expect to roll a 4?

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.