exam Maths Puzzle Numerical Ability

The speed of a stream is 6 mph. If a boat travels 98 miles downstream in the same time that it takes to travel 49 miles upstream, what is the speed of the boat in still water?

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exam Other Question

What is the vertex, focus, and directrix of the parabola with the equation of :
1. y=1/5(x-2)^2+5
2. y=-2(x+2)^2-3
3. y=3(x-2)^2+5

Find the equation of the parabola with:
4. find the lcm of
2x+2 x^2-1 2x^2-2x+2

would it be 2(x+1)(x^2-1)(x^2-x+1) or 2(x+1)(x-1)(x^2-x+1)