Which equation could be used to solve the problem?


Tony is on a train that travels 99 mi in 1 h.


At that rate, how many miles (d) will the train travel in 9 h ?


A.

d = 99 + 9


B.

d = 99 ÷ 9


C.

d = 9 ÷ 99


D.

d = 99 • 9