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Naddik [55]
3 years ago
8

Gabby,a college student,headed home for thaksgiving.He rode his bike at a speed of 18 miles per hour to the town where his two s

isters,Ariella and Rachelle,live. They all got in Ariellas car and drove to their patents home. On the car trip,the siblings averaged 60 miles per hour. The total distance from Gabbys house to their parents house (via his sisters house) is 435 miles,and Gabby traveled for 9 hours. How far is it from Gabbys house to his sisterss house?
Mathematics
1 answer:
MakcuM [25]3 years ago
5 0

Answer:

The distance is  S_1 = 45 \  miles

Step-by-step explanation:

From the question we are told that

   The speed at which Gabby rode his bike is  v  =  18 \ miles / hour

   The average speed of the car is  u =  60 \  miles / hours

   The distance from Gabby's house to the parents house is  d =  435 \ miles

   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

        S_1 + S_2 =  d

Here S_1 is the distance from Gabby's house to his sisters house which is mathematically represented as

     S_1 = t_1 *  v

=> Here t_1 is the time taken to move from Gabby's house to his sisters house

while  S_2 is the distance from his sisters  house to his parents house which is mathematically represented as

      S_2 = t_2 *  u

So

      vt_1  + ut_2 =  d

=>  18t_1  + 60t_2 =  435 --- (1)

Generally the total time taken to arrive his parents house from his house is mathematically represented as

        t_1 + t_2 = t

=>    t_1 + t_2 = 9 --- (2)

Solving equation 1 and 2  simultaneously we have that

        18t_1  + 60t_2 =  435 --- (1)

         t_1 + t_2 = 9 --- (2)

multiply equation 2 by 18  and equation 1 by 1

          18t_1  + 60t_2 =  435 --- (3)

         18t_1 +18 t_2 = 162 --- (4)

Substracting equation 3 from 4

          0t_1 + 42t_2 =  273

=>     t_2 = \frac{273}{42}

=>     t_2 = 6.5 \  hours

substituting t_2 into equation 2

       t_1 + 6.5  = 9 --- (2)

=>     t_1 =  2.5 \  hours

So the distance  from Gabby's house to his sisters house is mathematically represented as

          S_1 =2.5  * 18

=>        S_1 = 45 \  miles

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