exam Maths Puzzle Numerical Ability

a motorboat covers a certain downstream in a river in 5 hours. it cover the same distance upstream in 5 hours and a half. the speed of water is 1.5 km. find the speed of the boat in still water.

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exam Other Question
Find theta to four significant digits for 0< or= to 2pi.
54) cos theta=-0.9135
56) sin theta=-0.0436
58) cot theta= 1.860
60) csc theta= 3.940 Solve. 5(x - 2)^2 = 3

I do not understand how to complete this problem. Please help.