CITIC+Plaza,+A+Antico

CITIC Plaza in Guangzhou, China
The CITIC Plaza, built in Guangzhou, China is a skyscraper that stands at 1,283 ft. The CITIC Plaza was built in 1997 and happens to be the tallest concrete building in the world (1 fact)! It is the fourth tallest building in China, the seventh tallest building in Asia, but the thirteenth tallest in the world (second fact)! On this building, there are 80 floors and 2,206 sq. ft (third fact)!The CITIC Plaza is part of a complex with two other 38 story residential buildings.

Problem 1:
Ava and Sarah are having a catch on top of the CITIC Plaza. Ava miscalculates her throw and accidentally throws their ball right off the top of the building. Ava goes down to the ground and throws the ball up to Sarah. If Ava throws the ball upwards with a velocity of 300ft/s, and the final height of the building is 1,283 ft, how many seconds will the ball be in the air for in total? (**The bigger of the two answers is correct)**

Problem 2:
Ava and Sarah get bored of having a plain old catch, so Sarah decides to go down to the ground and have Ava drop the ball down to her. If Ava drops the ball from a height of 1,283 and the ball hits the ground before Sarah picks it up, how many seconds will it take for the ball to hit the ground?