SOLUTION: A moter car start with speed 70 km per hour with speed increasing every 2 hour By 10 km per hour .In how much time will it cover a distance of 345 km?

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Question 847177: A moter car start with speed 70 km per hour with speed increasing every 2 hour By 10 km per hour .In how much time will it cover a distance of 345 km?
Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
Car travels 140 km in the first 2 hours
Car travels 160 km in the next 2 hours

45 more km left, and at 90 kph it will take another 1/2 hr. Altogether it will take 4 1/2 hours.