Janet is three years older than her sister Julie Janet's brother is 8 years older than their sister Julie the sum of all their ages is 55

Julie is 14.67, Janet 17.67 and Brother 22.66

Step-by-step explanation:

Let Julie age be x

Janet: x+3

Brother: x+8

x+x+3+x+8=55

3x+11=55

3x=44

x=14.7

9 km/h or 48 km/h

Step-by-step explanation:

Let the distance is d, speed is s

As per given we have:

d/s = 5

36/s + (d - 36)/(s + 3) = 5 - 1/4

Substitute d with 5s and solve for s:

36/s + (5s - 36)/(s + 3) = 19/4

36(s + 3) + s(5s - 36) = 19s(s + 3)/4

4(36s + 108 + 5s² - 36s) = 19s² + 57s

20s² + 432 = 19s² + 57s

s² - 57s + 432 = 0

s² - 9s - 48s + 432 = 0

s(s - 9) - 48(s - 9) = 0

(s - 9)(s - 48) = 0

s -9 = 0 ⇒ s = 9 km/h

s - 48 = 0 ⇒ s = 48  km/h

The original speed of grey wolf can be 9 km/h or 48 km/h

Step-by-step explanation: