Math with Mrs. Sarah

(Rusczyk, Prealgebra)

A freight train travels 1 mile in 1 minute 30 seconds. At this rate, how many miles will the train travel in 1 hour?

If you walk for 45 minutes at a rate of 4 mph and then run for 30 minutes at a rate of 10 mph, then how many miles have you gone at the end of one hour and 15 minutes? What was your average speed for the journey?

Shelly drove the 50 miles from her home to her office at an average speed of 75 miles per hour. Coming home, she encountered heavy traffic and drove the same 50 miles at an average speed of 50 miles per hour. What was her average speed for the entire 100-mile roundtrip?

Ben leaves his house at 7 a.m. and bikes at a constant speed of 15 miles per hour due east. Alisha lives 100 miles due east of Ben, leaves her house at 8 a.m., and bikes at a constant speed of 10 miles per hour due west. At what time do they meet?

15 groups of n add 10 groups of n make 25 groups of n