A boy has to cover 4km to catch a bus. He walks part of the distance at 3km/h and runs the rest at 5km/H. If he takes 1 hour to complete the distance, how many kilometers does he walk?

d 25 pi/6

step-by-step explanation:

the diameter is 10 inches

the radius is 1/2 of the diameter or 5 inches

the area of the circle is

a = pi r^2

  = pi 5^2

  = 25 pi

the slice is 60 degrees of the entire circle.

60 degrees out of 360   60/360 = 1/6

the area of the slice is 1/6 of the circle

a slice = 1/6 a circle

a slice = 1/6 * 25 pi

combine all like terms then its just a 2 step equation