分数计算器

In a flight of 600 miles, an aircraft was slowed down due to bad weather. As a result, the average speed for the trip reduced by 200 miles/hr and the time of flight increased by 30 minutes. The duration of the flight during normal times without bad weather is:

x and y are positive integers. If the given expression 864 × 14^14x + 93 × 47^12y when divided by 5 leaves remainder p and when divided by 9 leaves remainder q, then what is the remainder when p + q is divided by 11?

If G represents the number of multiples of 3 between 3³⁰ and 3⁵⁰, inclusive, then G must be:

I. Odd

II. Divisible by 3

III. Divisible by 9

30²⁰–20²⁰ is divisible by all of the following values, EXCEPT:

Back in 1930, Tillie had to memorize her multiplication facts from 0*0 to 12*12. The multiplication table she was given had rows and columns labeled with the factors, and the products formed the body of the table. To the nearest hundredth, what fraction of the numbers in the body of the table are odd?