Question 118243: Two (2) planes leave at the same time. One flies west 300 km per hour. The other flies east 450 km per hour. In how many hours will they be 2 250 km apart.
Answer by tutorcecilia(2152)   (Show Source):
You can put this solution on YOUR website! Use the distance formula for each flight: Distance = (rate)(time)
Plane #1
Distance = (300)(t)
.
Plane #2
Distance = (450)(t)
.
Since their total distance is 2,250 miles and their time (t) will be the same, add their (rate)(time)+ (rate)(time)=2250, together:
.
300t+450t=2,250 [solve for time (t)]
470t=2250
t=2250/470
t=3 hours
.
Checking:
Plane #1
d=(300)(3)=900
Plane #2:
d=(450)(3)=1350
Adding their miles together (rate)(time) + (rate)(time) = 900+1350=2250
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