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NeX [460]
3 years ago
14

It took Brian 6 hours to drive to the sales conference. He took the same route on the way back home, but

Mathematics
1 answer:
g100num [7]3 years ago
6 0

Answer:  54 mph

Step-by-step explanation:

d-the distance

s+9  -  the speed to the conference

d=6*(s+9)

s- is the speed on the way back home

d=7*s

so    6*(s+9)=7*s

       6s+54=7s

     -6s          -6s

       54= 7s-6s

       s=54  mph

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