The car goes up the mountain road for 30 minutes, and down – 15 minutes. The length of the road is 9 km.
| December 2, 2020 | education
The car goes up the mountain road for 30 minutes, and down – 15 minutes. The length of the road is 9 km. How much higher is the speed of the car when descending?
30 minutes – 1/2 hour
15 minutes – 1/4 hour
Ascent speed 9: 1/2 = 9 * 2/1 = 18 km / h
Descent speed 9: 1/4 = 9 * 4/1 = 36 km / h
36-18 = 18 km / h
Answer: the descent speed is 18 km / h more than the ascent speed
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