To find the distance that Nikhil walked compared to Amara, we need to divide Nikhil's distance by Amara's distance. Nikhil's distance is 1 1/2 miles, which is equal to 1 + 1/2 = 3/2 miles. Amara's distance is 5/8 of a mile. Therefore, we can divide 3/2 by 5/8 to find the ratio of Nikhil's distance to Amara's distance:
(3/2) / (5/8) = (3/2) * (8/5) = (24/10) = 2 2/5
Therefore, Nikhil walked 2 2/5 times as far as Amara.