I have two problems right now the 1st is an equation

1, Two people walk 240 meters at a constant speed

Person A takes 100 more steps than the other,

Person B's steps are 20cm longer, Find how mant steps they take

2. I did most of the problem but I can't get any farther on this

9(u^2+uv+v^2)=7(u+v)^2

u=2^(x+y)

v=3^(x-y)

The orignal problem is

Solve System

4^(x+y)=27+9^(x-y)

8^(x+y)-21*2^(x+y)=27^(x-y)+7*3^(x-y-1)