exam Maths Puzzle Numerical Ability

Rewrite as a single logarithm:
2logx - 1/2log(x^2+1) + 2log(x-3)

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exam Other Question

A freight train left a station at 12 noon going at a rate of 50 miles per hour. At 1 pm, a passenger train left the same station going south at the rate of 60 miles per hour. At what time were the trains 270 miles apart? The price per person to rent a limousine for a prom varies inversely as the number of passengers. If 5 people rent the limousine, the cost is $70 each. How many people are renting the limousine when the cost per couple is $18.50?