i need to know how fast this bat flew in 4 hours

Question

a bat flying for 6 hours at an average speed of 9 km/h. the bat flew at 11km/h during the first 2 hours of its flight. how fast did the bat fly the last 4 hours?

Answer 1

distance=rate*time

d=rt

flying 6 hours at 9 km/hr means the bat flew a distance of 6*9=54 km

11 km/hr for 2 hours means the bat flew 11*2=22 km

54-22=32 km left to fly in 4 hours

d=rt

32=r*4

r=32/4

r=8 km/hr for the last 4 hours