The car moved at a speed of 15 m / s for 2 hours, and then drove another 72 km at a speed of 20 m / s.
| December 7, 2020 | education
The car moved at a speed of 15 m / s for 2 hours, and then drove another 72 km at a speed of 20 m / s. What is its average speed all the way?
1h = 3600s, 2h = 7200s
7200sec at a speed of 15m / s
72km = 72000m
72000m at a speed of 20m / s
72000: 20 = 3600sec
15 * 7200 = 108000m
(108000 + 72000) 🙁 7200 + 3600) = 180000m: 10800sec = 60km / h
Answer: 60 km / h is an average speed.
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