The bus traveled at a speed of 60 km / h for 0.5 s and the remaining 120 km traveled at a speed

univerkov | September 4, 2021 | education

The bus traveled at a speed of 60 km / h for 0.5 s and the remaining 120 km traveled at a speed of 80 km / h. What is the average speed?

To find out the average speed of the specified bus, consider the formula: Vav = S / t = (SA + SB) / (tA + tB) = (VA * tA + SB) / (tA + SB / VB).

Data: VA – the first speed of the bus (VA = 60 km / h); tA – first time (tA = 0.5 h); SB – second distance traveled (SB = 120 km); VB is the second speed of the bus (VB = 80 km / h).

Let’s calculate: Vav = (VA * tA + SB) / (tA + SB / VB) = (60 * 0.5 + 120) / (0.5 + 120/80) = 150/2 = 75 km / h.

Answer: The average speed of this bus is 75 km / h.

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