book Maths Puzzle Numerical Ability

A={-10,-9,-8,-7,-6,-5,-4,-3,-2,-1}

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If Car A were traveling at 40 miles per hour and Car B was traveling 150 feet behind Car A at 45 miles per hour, how many seconds will it take before Car B runs into Car A? if a salesman is paid $140 commission on the sale of a 2,800 sailboat.what is his commision rate.