book Maths Puzzle Numerical Ability

Can you help me answer this question? The question is b=17/8 which is a fraction times h=90 how can I find the area of that kind of paralellogram.

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book Other Question

Two trains leave Chicago, one traveling East at 30 miles per hour, and one traveling west at 40 miles per hour. When will the trains be 210 miles apart?
(We are supposed to be using the formula d=rt.)
Can you also show me how to find the equation of the line parallel to
3x-4y=10
And it has to pass through (6,0)

Thank you for your help.