Answer :

First, we divide 54 by 4.5 to find out how many miles she can ride in 1 hour, then multiply that to 6 to find how many miles she can ride in 6 hours. 54 / 4.5 = 12, and 12 x 6 = 72, so she can ride 72 miles in 6 hours. :)
jmp99
you have to divide 54 by 4.5 to get the rate per hour then you times that by six and you get 72 so it would look like this 
54/4.5=12*6= 72 so your answer would be 72