A car from city A to city B travels half the time at a constant speed in 60 km / h
| September 30, 2021 | education
A car from city A to city B travels half the time at a constant speed in 60 km / h. If its average speed is 65 km / h, what will be its constant speed for the rest of the time?
Task data: V1 (constant speed of a given vehicle in the first half of the time) = 60 km / h; Vav. (average speed between city A and city B) = 65 km / h.
The constant speed of a given car for the rest of the time can be expressed from the formula (a special case, since t1 = t2 = 0.5t): V = (V1 + V2) / 2, whence V2 = 2V – V1.
Let’s calculate: V2 = 2 * 65 – 60 = 130 – 60 = 70 km / h.
Answer: During the rest of the time, the given car moved at a speed of 70 km / h.
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