Average speed

When the bus stops at a bus stop driving average speed is 45 km/h. If it did not stop, it would drive at a speed of 54 km/h. How many minutes of every hour does it spend at stops?

Correct answer:

t =  10 min

Step-by-step explanation:

45•1 = 54•(1-t/60)

54t = 540

t = 10

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