Question 551351
Let the distance be x miles
resting time = 1 hour

Total driving time = 4.5 -1 = 3.5 hours

Time onward + time return = 3.5 

let d= x

t=d/r
x/30 +x/40 =3.5

multiply equation by 1200 (30 * 40)

40x +30x= 4200
70x = 4200
/70
x= 60 miles

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