Question 911252
r*t=d
t=d/r
t=315/r
(r+5)*t=360
t=360/(r+5)
t=315/r
315/r=360/(r+5)
360*r=315*(r+5)
360*r=315*r+315*5
45*r=315*5
r=1575/(45)
r=35 mph truck
r+5=40 mph car
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