book Maths Puzzle Numerical Ability

Between April 1,2004, and May 1,2004, the world populationgrew from approximately 6,358,000,000 to 6,364,000,000. What is the growth rate per month given in scientific notation?

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book Other Question
What is the square route of 121??? An airplane leaves Chicago for Cleveland at a speed of 475 mph. Twenty minutse later, a plane going to Chicago leaves Cleveland, which is 350 miles from Chicago, at a speed of 500