Question
A car is driven first on a dirt road at a speed of 30 mph and then on a paved road with a speed of
A car is driven first on a dirt road at a speed of 30 mph and then on a paved road with a speed of 60 mph. The total trip was 210 miles and took 4 hours. How long did the car travel on the dirt road?
The answer is the car was on the dirt road for 1 hour.
My question is, how did they come up with this answer. Steps and explanation would be helpful. Thank you.
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Linear Algebra and Its Applications
Authors: David C. Lay
4th edition
321791541, 978-0321388834, 978-0321791542
