SOLUTION: one car travels 40 km/hr faster than another. While one travels 150 km, the other goes 350 km. Find the speed of the slower car.

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Question 200842: one car travels 40 km/hr faster than another. While one travels 150 km, the other goes 350 km. Find the speed of the slower car.
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let s = the speed of the slower car
Let s+%2B+40 = the speed of the faster car.
The faster car will go further in the same time, so
350+=+%28s+%2B+40%29%2At km
and
150+=+st
t+=+150%2Fs
Substituting,
350+=+%28s+%2B+40%29%2A%28150%2Fs%29
350+=+150+%2B+6000%2Fs
350s+=+150s+%2B+6000
200s+=+6000
s+=+30 km/hr answer