SOLUTION: A bus and a car leave the same place and travelled in opposite directions. If the bus is traveling at 60km/h and the car is traveling at 75km/h, in how many hours will they be 405

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Question 857331: A bus and a car leave the same place and travelled in opposite directions. If the bus is traveling at 60km/h and the car is traveling at 75km/h, in how many hours will they be 405 kilometres apart?
Thank you.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

first solve for Distance each traveled

t = D/r

 x%2F75kmph+=+%28405-x%29%2F60kmph  | Cross Multiplying to solve for x

   75(405-x) = 60x

   75*405- 75x = 60x

        75%2A405%2F135 = x = 225km,   

225km%2F75kmph+=+3hrs

In 3hrs they will be 405 kilometres apart?