SOLUTION: A red car and a blue car set off from the same point to travel the same journey. The red car has a start of three minutes before the blue car sets off. If the red car travels 40 kp

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Question 856043: A red car and a blue car set off from the same point to travel the same journey. The red car has a start of three minutes before the blue car sets off. If the red car travels 40 kph and the blue car travels 60 kph, how many kilometres will have been travelled when the cars are level?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Rate*Time=Distance
D%5Br%5D=40%28t%2B3%2F60%29
D%5Bb%5D=60%28t%29
Find D%5Br%5D=D%5Bb%5D
40%28t%2B3%2F60%29=60t
40t%2B2=60t
20t=2
t=2%2F20=1%2F10
They are equal in 1/10 hour or 6 minutes.
D=60%281%2F10%29=6 km