Answer:
2.5 hours
Step-by-step explanation:
Rember the equation, Time * Speed = Distance,
or for simplicity, T * S = D.
It is known that:
Grants's speed = 700 km/h
Grant's time = x (hours)
Darrin's speed = 500 km/h
Darrin's time = x +1 (hours)
*x+1 because Darrin left an hour before aGrant*
This mean's that
Darrin's distance: 500 km/h * (x+1) hours
Grant's distance: 700 km/h * x hours
Since they both have traveled the same distances then the equations will have to equal each other.
500km/h * (x+1) hours = 700 km/h * x hours
simplify and solve.
500x + 500 = 700x
500 = 200x
5/2 = x
2.5hours = x
