book Maths Puzzle Numerical Ability

Can someone help me with these two problems?
(1)
Add. Write the answer in the lowest terms.

3/8 + 5/8
(2)
Add. Write the answer in lowest terms.
5/9 + 8/9
Thank you.

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book Other Question

I am stumped on this question. Can someone please help me with it.

Find the equation, in standard form, including all integer coefficients, of the line perpendicular to 3x - 4y = 9 and passing through (-2, -1). Bobby and Rick are in a 10-lap race on a one-mile track. Bobby, averaging 90mph, has completed two laps just as Rick is getting his car onto the track. What speed does Rick have to average to be even with Bobby at the end of the tenth lap?