Question

Lydia rode 243 miles in a three day bike trip. On the first day, Lydia rode 67 miles. On the second day, she rode 92 miles. How many miles per hour did she average on the third day if she rode for 7 hours?

Answer 1

(243 - 67 - 92)/7 = ________ mph

Answer 2

It gives you the total amount of miles traveled: 243 mi. In order to find out how many miles she traveled on the last day, you need to subtract the milage from the other two days:

243 - 67 - 92 = 84 mi.

Lydia traveled 84 mi on the last day.

In she rode for 7 hrs then that means she covered 84 mi during that time. In order to find mph (miles / hour) you just have to divide 84 by 7:

84/7 = 12 mph

She averaged a speed of 12 mph.