A horse gallops a distance of 60 m and 15 seconds. Then, he stops to eat some grass for 20 seconds. Next, he trots for 25 seconds over 60 m. The horse trots in the same direction he galloped. Finally the horse races back home (back to it starting position) traveling 120 m in 20 seconds. Calculate the horses average speed for the entire journey.

check the attached graph for the answer

Step-by-step explanation:  Please find the attached file for the solution

Using long division;
Dividing ; 2x³- 3x² -17x -30 (Dividend)

BY : x+3 ( Divisor)
     dividend : 2x³- 3x² -17x -30
 
- divisor * 2x²  2x² + 6x²
 Remainder            - 9x² -17x -30
divisor * -9x            - 9x² - 27x
Remainder                       10x - 30
Divisor  * 10x^0                10x + 30
Remainder                                - 60
 Thus;
The  Quotient is 2x² -9x +10
Remainder is - 60