Which equation could be used to solve the problem? The Jensens drove 400 miles in 8 hours. How many miles per hour did they drive (m)?
a. m = 400 miles • 8 hours
b. m = 400 miles ÷ 8 hours
c. m = 400 miles + 8 hours
d. m = 8 hours ÷ 400 miles