SOLUTION: on a friday night your limo travels for two hours int the carpool lane at 8kph, faster than the traffic to go to prom.the returning trip takes 3 hours on the same route going 3kph

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Question 173372: on a friday night your limo travels for two hours int the carpool lane at 8kph, faster than the traffic to go to prom.the returning trip takes 3 hours on the same route going 3kph slower than traffic, what was the speed of traffic?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let a= the speed of the traffic in km/hr
1st trip:
d+=%28a+%2B+8%29%2A2
2nd trip:
d+=+%28a+-+3%29%2A3
%28a+%2B+8%29%2A2+=+%28a+-+3%29%2A3
2a+%2B+16+=+3a+-+9
a+=+25
The speed of the traffic was 25 km/hr