book Maths Puzzle Numerical Ability

the speed of a boat in still water is 24 mph. if the boat travels 54 miles upstream in the same time it takes to travel 90 miles downstream, find the speed of the current.

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book Other Question

write answers in descending powers of x ADD
1.(xsquared+3x)+(4xsquared-2) please help me with this problem .
Find (a)the directrix (b)the focus and (c)the roots of the parabola y=x^2-5x+4 (x^2 is x squared) thanks