SOLUTION: a bus travel at a distance of 90 km in 2 hours and another 30 km in 1 hour. what is the average speed of the bus?

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Question 536308: a bus travel at a distance of 90 km in 2 hours and another 30 km in 1 hour. what is the average speed of the bus?
Answer by Alan3354(69443) About Me  (Show Source):
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a bus travel at a distance of 90 km in 2 hours and another 30 km in 1 hour. what is the average speed of the bus?
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d = 90 + 30 = 120 km
t = 2 + 1 = 3 hours
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r = d/t