question about

Question

             A bus took a six hour trip and traveled 225 miles. The speed was 40 mph for the first part of the trip, and then decreased to 25 mph for the second part of the trip. How many hours were traveled at each speed?    

                          hours at 40 mph

                         hours at 25 mph

Answer 1

distance=rate*time

d=rt

225=40t+25(6-t)

225=40t+150-25t

225-150=40t-25t

75=15t

t=75/15

t=5 hours at 40 mph

6-5=1 hour at 25 mph