I have a couple questions: Write an equation and use it to solve the problem.

1.solve

The yukon River is 1,980 miles long, and twice as long as the platte river. how many miles long is the platte river?

2. solve

Olivia is 48 inches tall, and 2/3 as tall as her brother cameron. In inches, how tall is cameron?

3.solve

After arriving home from school luis read for 1/3 of an hour. if he reads for 1 1/6 hours after dinner, how many hours will luis read altogether?

4.solve

When compared to tasha jared spent 20 additional minutes kissing his girlfreind. he took 45 minutes kissing his girlfreindd. how long does it take tasha to kiss her boyfreind?

Solve the multiplicaton.

5.

6.9 x 4.2

6.

5.8 x 0.54

7.

0.7 x 6.25

Divide.

8.

4.5 divided by 0.05

9.

2.32 divided by 0.04

10.

5.43 divided by 0.6

Solve the word problems.

11.

The gym at walters middle school is 5/6 the height of a 30 foot tall building. What is the height of the gym in feet?

The best answer i get i will give brailiest.:)
<3