Non metals are all the way on the right side
Metalloids are the stair case
Metals are on the left side
Answer : Cat will reach tree first.
Explanation :
It is given that,
Total distance between dog and tree is 30 yards. The cat has 10 yards lead. So, the distance between cat and tree is 20 yards.
Speed of cat is 6 Yards/ sec.
Speed of dog is 8 Yards/sec.
speed of cat is, 


Now, speed of dog is, 


It is clear that, cat is taking less time as compared with dog. So, the cat will reach tree first.
Dropping a nuke on another country.
I would think 2.759kmockinbirds if you consider mockingbirds equal to a metre and kmockinbird to kilometres