The car drives 180 miles in 4 hours, so its average speed is 180 miles / 4 hours = <<180/4=45>>45 miles per hour.

In the next 3 hours, the car will drive 45 miles/hour * 3 hours = <<45*3=135>>135 miles.

# Answer

135
<|im_start|>system
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<|im_start|>user
A car driving cross-country traveled 180 miles in 4 hours. At this rate of speed, how many miles further will the car travel in the next 3 hours?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
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user
135
A car driving cross-country traveled 180 miles in 4 hours. At this rate of speed, how many miles further will the car travel in the next 3 hours?
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