SOLUTION: two cars leave town at the same time going in the same direction on the same road. one travels 30 mph, the other travels at 45 mph. in how many hours will they be 150 miles apart?

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Question 356580: two cars leave town at the same time going in the same direction on the same road. one travels 30 mph, the other travels at 45 mph. in how many hours will they be 150 miles apart?
Found 2 solutions by robertb, mananth:
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
let t = # hours the two cars are in motion.
Then by the formula D = RT, 45t+-+30t+=+150.
15t+=+150,
t+=+10.
Therefore the two cars will be 150 miles apart after 10 hours.

Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
two cars leave town at the same time going in the same direction on the same road. one travels 30 mph, the other travels at 45 mph. in how many hours will they be 150 miles apart?
...
speed of A = 30 mph
Speed of B = 45 mph
...
B will get ahead by 45-30 = 15 miles every hour.
Time = distance/speed
..
150/15
=10.
after 10 hours they will be 150 miles apart
...
m.ananth@hotmail.ca