The jones family drove to kankakee in 5 hours and returned in 4 hours. their rate on the return trip was 9 mph faster than their rate going. find their rate going?

36 mph

Step-by-step explanation:

Let

D be the distance covered in on trip

x be the rate on return

y be the going rate

if the Jones family drove to Kankakee in 5 hours and returned in 4 hours.

y = D/5 and x = D/4

D = 5y and D = 4x

5y = 4x Equation 1

Their rate on the return trip was 9 mph faster than their rate going

x = y + 9  Equation 2

substitute into equation 1

5y = 4(y + 9)

5y = 4y + 36

collect like terms

5y - 4y = 36

y = 36 mph

answer 1 : option "c"

answer 2 : option "d"

answer 3 : option "b"

answer 4 : option "d"

answer 5 : option "b"

answer 6 : option "a"

answer 7 : option "c"

answer 8 : option "d"

answer 9 : option "c"

answer 10 : option "d"

answer 11 : option "c"

answer 12 option "b"

answer 13 option "c"

answer 14 option "c"

answer 15 option "d"

answer 16 option "a"

answer 17 option "b"

answer 18 option "c"

answer 19 option "a"

answer 20 option "a"

answer 21 option "c"

d

b). 4320 have a nice day