Brice rides his bike at a constant speed of 8 mi/h for 15 minutes, then speeds up and rides at a constant speed of 10 mi/h for 30 minutes. During these 45 minutes, how many miles did he travel?
Answer: 7 miles
Do you have to find for 15 minutes and 30 minutes?
you need to convert minutes to hours, you can use a ratio
then 8*(15/60) + 10*(30/60) = 7 miles