A bus driver planned a 2 day trip. He travelled 360 km at a certain speed on the first day. He travelled 153 km on the second day but because of weather conditions he reduced his speed by 9 km/h. The total travelling time for the trip was 9 hours. How fast did he travel the first day?

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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A bus driver planned a 2 day trip. He travelled 360 km at a certain speed on the first day. He travelled 153 km on the second day but because of weather conditions he reduced his speed by 9 km/h. The total travelling time for the trip was 9 hours. How fast did he travel the first day?  

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