book Maths Puzzle Numerical Ability

Susan drove 1500 miles to Daytona Beach for spring break. On the way back she averaged 10 miles per hour less and the drive back took her 5 hours longer. Find Susan's average speed

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How do u prove this?...Show that 3 divides n^3-n for all positive integers n. And does 4 divide n^4-n for all positive intgers n? AND i need to use proof by induction i think, i get the first part but then get stuck at the end...please help general term of infinite sequence: tn= pie(3/11)^(n+1) , pie=3.14....
How many terms must be added to reach a sum that is greater than 0.32?

i know at least 5 terms are needed