Please help me wth this

If eh = hg and hg=16, find the diameter of k

Write 5(6x+4)-2(5x-2) in the form a(bx+c) where a,b and c integers and a> 1

You can ride your bike around your block 6 times and the whole neighborhood 5 times in 16 minutes. you can ride your bike around your block 3 times and the whole neighborhood 10 times in 23 minutes. how long does it take you to ride around the neighborhood?