144 miles in 1 and 1/4 hours

Question

whats the miles per hour

 

Answer 1

speed = distance / time

 

distance = 144 miles

 

time = 1 and 1/4 hours = 1.25 hours

 

speed = (144 miles) / (1.25 hours) = 115.2 miles per hour

Answer 2

      "miles per hour"

)144 miles) per (1 and 1/4 hours)
(144 miles) / (1 1/4 hours)

(144 miles) / ( 5/4 hours )                [convert to improper fraction]

( (144) / (5/4) )  miles/hour

( (144)*(4/5) ) miles/hour          [to divide by fraction; invert and multiply]

( 576/5 ) miles/hour

  115 1/5 miles/hour             [convert back to mixed numbers]

  115 1/5 miles per hour         [read this way]