Tina is going to bake at least 570 cookies for a wedding party using ovens A and B. The number of cookies baked by oven A per hour is 10 more than twice the number of cookies baked by oven B per hour.
(a) If 40 cookies can be baked by oven B in an hour and oven B can only operate for 3 hours, at least how many hours has oven A operated for ?
(b) If both ovens A and B can only operate for 4 hours, at least how many cookies should be baked by oven B in an hour ?
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