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lizard2oo3
Since he went 168 miles in 4 hours, then his speed is 42 mph. Then, 504 divided by 42 is 12. It will take 12 hours at a steady pace of 42 mph to reach 504 miles. 
mayormaynotbe
Hi there.

First, we want to find out how many miles Jim can travel in one hour.

168 ÷ 4 = 42 mph

Now, we take 504 and divide it by the amount he can drive in one hour.

504 ÷ 42 = 12

It will take Jim 12 hours to drive 504 miles.