Train A covers 240 miles in the same time train B covers 180 miles. If the average speed of train A is 20 mph more than that of train B, then what is the average speed of train B?
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b speed-x
a speed-20+x
240/20+x=180/x
4/20+x=3/x
4x-3x=60
x=60
a speed-20+x
240/20+x=180/x
4/20+x=3/x
4x-3x=60
x=60
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