Answer:
1.4 hours have elapsed when the father and his son are 20.16 miles apart
Step-by-step explanation:
The son runs at a speed of 8.1 mph.
The father runs at a speed of 6.3 mph.
They run in opposite directions, so per hour, their distance increases at the rate of 8.1 + 6.3 = 14.4 mph.
How many hours will have elapsed when the father and his son are 20.16 miles apart?
Rule of 3.
1 h - 14.4 miles
x h - 20.16 miles
[tex]14.4x = 20.16[/tex]
[tex]x = \frac{20.16}{14.4}[/tex]
[tex]x = 1.4[/tex]
1.4 hours have elapsed when the father and his son are 20.16 miles apart
