Answer:
Step-by-step explanation:
To answer the question we must find the Time of B.
This should be easy considering the fact that we have are given the Distance and the Speed.
[tex]\frac{D}{S}[/tex] = T
[tex]\frac{60}{40}[/tex] = 1.5 hours or 1 hour and 30 minutes
Now, we know both routes that the same amount of time.
Now we know both routes take 1 hour and 30 minutes
Now we divide 90 by 1.5 to get our Speed for A
[tex]\frac{90}{1.5}[/tex] = 60km/hr
