A student spends 5/6 hour grading 3/5 of a student's essay. At this rate, how long does it take the teacher to grade the students entire essay?

Step-by-step explanation:

Given that :

Time spent = 5/6

Fraction of students graded = 3/5

Amount of time grading 3/5 of students = 5/6 hours

Total fraction of students = 1/1

If 3/5 of students take 5/6 hours

Then, 1/1 of students will take x

Using cross multiplication :

3/5 = 5/6

1 = x

3x / 5 = 5/ 6

3x * 6 = 5 *5

18x = 25

x = 25 / 18

x = 1.38888 hours

since the airplane is moving with constant speed then the distance travelled can be calculated by x=u*t

in km/h would be:

x=640*3.5=2.240 km

in m/s would be:

u=640 km/h= 640.000 m/h =640.000/ 3600 m/s =177.8 m/s

t= 3.5 h= 3.5 * 3600 s=12.600 s

then x=u*t= 177.8*12.600= 2.240.280 m

answer: 59

step-by-step explanation: