Insects known as walking sticks move very slowly. they can move 2 inches every 5 seconds. at this rate, how far could a walking stick go in 30 seconds?
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If 30 lb of rice and 30 lb of potatoes cost ? $27.60? , and 20 lb of rice and 12 lb of potatoes cost ? $15.04? , how much will 10 lb of rice and 50 lb of potatoes? cost?