SOLUTION: Willie left the science museum and traveled west at an average speed of 30km/h. Gabriella left two hours later in the opposite direction at an average speed of 35km/h. Find the num

Question 1166391: Willie left the science museum and traveled west at an average speed of 30km/h. Gabriella left two hours later in the opposite direction at an average speed of 35km/h. Find the number of hours Gabriella needs to travel before they are 255km apart
Found 2 solutions by josgarithmetic, Boreal:
Answer by josgarithmetic(39625) (Show Source): You can put this solution on YOUR website!
Gabriella leaving two hour later means that Willie and Gabriella were 60 kilometers apart when Gabriella started travel.

At that time, separation speed was .

-------------simplify and solve this.
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
The distance apart when Gabriella leaves is 60 km, 2*2Willie's speed.
They have to be 255 km apart. Their combined speed is 65 km/h in opposite directions
195/65=3 hours Gabriella has to travel
in 3 hours goes 105 km.
W. had gone 5 hours at 30 km/h, and that is 150 km

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