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Verified Answer :

If that was supposed to be "$150" then it would be 5 hours.

$
20 (1 hrs)
$50 (2 hrs
$
80 (3 hrs)
$110 (4 hrs)
$
140 (5 hrs)

If that was supposed to be "$1.50", then a few minutes.

35x+20=150, you would have to figure out x so subtract 20 from both sides and get 35x=130 then divide each side by 35 and x= 26/7 then you'd simplify that and get 3.74 but you can't have that many canoes so 3 or 4