3 years ago

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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