Answer: He drove 238 miles while crossing the bridge.
Explanation:
Since we have given that
Number of miles that bridge has = 7 miles
Number of times Julian crossed = 34
We need to find the number of miles that he drive while crossing the bridge.
So, Number of miles that he drove is given by
Number of miles that bridge has × Number of times he crossed

Hence, he drove 238 miles while crossing the bridge.