Question 913961
r*t=d
t=d/r
t=486/r
(r+8)*t=534
t=534/(r+8)
t=486/r
486/r=534/(r+8)
534*r=486*(r+8)
534*r=486*r+486*8
48*r=486*8
r=3888/(48)
r=81 mph
r+8=89 mph
check
486/81=534/(81+8)
6=6
ok
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