There's an old car that needs to go up and down a hill. The hill is 1 mile going up, and 1 mile going down . Because the car is old, it can only average a speed of 15 mph during the ascent, but may be able to go faster during the descent.
The question is: how fast must the car be going downhill, in order for its speed to reach an average of 30 mph for the entire 2-mile journey?
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✓ The hill is 1 mile going up,the car can only average 15 mph going up the hill . The hill also 1 mile down .
✓ Let S denotes the speed ( in mph) of car during downward motion.
✓The average speed of car is 30 mph in the entire trip
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