Asked by Chingnong

Devon travels 40 km to Edmonton by car, and then returns by bus. The average speed of the car is 20 km/h greater than the average speed of the bus. If Devon's total travel time is 54 min, what is the average speed of the bus?
Answered by Chingnong
Help needed urgently. Please Help.
Answered by Steve
since time = distance/speed, if the bus's speed is x, then

40/x + 40/(x+20) = 9/10

Now just find x, and x+20
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