The bus route consists of three equal sections. On the first section, the bus ran for 4.2 hours at a speed of 50 km / h

| June 30, 2021 | education

The bus route consists of three equal sections. On the first section, the bus ran for 4.2 hours at a speed of 50 km / h, and on each next section it increased the speed by 10 km / h. how long did the bus take all the way?

1) Since the route consisted of three sections of the same length, we first calculate the length of each such section: 50 · 4.2 = 210 (km);

2) Determine the value of the bus speed on the second section of the route: 50 + 10 = 60 (km / h);

3) Find out how long it took the bus to overcome the second section: 210: 60 = 3.5 (h);

4) Let’s calculate the speed of the bus on the last section of the route: 60 + 10 = 70 (km / h);

5) Let’s find how long the bus moved on the third section: 210: 70 = 3 (h);

6) Determine how much time the bus spent on the entire journey: 4.2 + 3.5 + 3 = 10.7 (h).

Answer: the bus spent 10.7 hours for the whole journey.



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