Answer:
The distance is
Step-by-step explanation:
From the question we are told that
The speed at which Gabby rode his bike is
The average speed of the car is
The distance from Gabby's house to the parents house is
The time taken for Gabby to get to his parents house is t = 9 hours
Generally the distance from Gabby's house to his parent house is mathematically reparented as
Here is the distance from Gabby's house to his sisters house which is mathematically represented as
=> Here is the time taken to move from Gabby's house to his sisters house
while is the distance from his sisters house to his parents house which is mathematically represented as
So
=>
Generally the total time taken to arrive his parents house from his house is mathematically represented as
=>
Solving equation 1 and 2 simultaneously we have that
multiply equation 2 by 18 and equation 1 by 1
Substracting equation 3 from 4
=>
=>
substituting into equation 2
=>
So the distance from Gabby's house to his sisters house is mathematically represented as
=>