exam Maths Puzzle Numerical Ability

A boat travels 65 miles downstream in 5 hours and 15 miles upstream in 3 hours. Fin the ordered pair that tells the speed of the boat, (b) and the speed of the current, (c)

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Please help!!
The growth in the population of a certain rodent at a dump site fits the exponential function, A(t)=336e^(0.031t), where t is the number of years since 1963. Estimate the population in the year 2000. How would I find all the 7-th roots of -1+i and plot them on an Argand diagram? Thanks, Simon