Question 547714

Let the distance be y
it is the same for both
the speeds are different

y/x=9
y=9x

y/x+7 =8
y=8(x+7)

9x=8(x+7)
9x=8x+56
9x-8x=56
x=56 Ellen's speed

Barb's speed = 56+7 = 63 mph