exam Maths Puzzle Numerical Ability

A boat travels 30 miles upstream in 4 hours. The trip downstream takes 2.5 hours. Find the rate of the boat in still water.

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Jan invested $1200 at a certain simple interest rate and $2200 at a rate 3% higher. Her annual earnings were $253. find the two interest rates if she earned $121 more on the larg The number of germs in a dish after t minutes is given as B=25e^(kt). If there are 2191 germs present after 6 minutes, find k (round out to 4 places).