SOLUTION: A round-trip by bus takes 12 hours. If the rate going was 54 kph and the rate returning was 90 kph, how far was the round-trip?

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Question 584488: A round-trip by bus takes 12 hours. If the rate going was 54 kph and the rate returning was 90 kph, how far was the round-trip?
Answer by lwsshak3(11628) About Me  (Show Source):
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A round-trip by bus takes 12 hours. If the rate going was 54 kph and the rate returning was 90 kph, how far was the round-trip?
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let x=going travel time
12-x=return travel time
Distance=speed*travel time
54x=90(12-x)
54x=1080-90x
144x=1080
x=7.5 hrs
12-x=4.5 hrs
Round-trip distance=7.5*54+4.5*90=810 km