Timothy leaves home for skedunk 400 miles away. after 2 hours, he has to reduce his speed by 20 mph due to rain. if he takes 1 hour for lunch and gas, and reaches skedunk 9 hours after he left home, what was his initial speed?
Accepted Solution
A:
The entire trip took him 9 hours. It took him 1 hour for lunch and gas, so he drove for 8 hours. He drove a total of 400 miles. He drove the first x miles at a higher speed, s, for 2 hours. Then he drove the rest of the distance, 400 - x miles, at a lower speed, s - 20, for 6 hours.