Henry runs 10 miles in 85 min. at the same rate how many minutes would he take to run 8 miles?

For 10 miles, he takes = 85 min

then, 1 mile = 85/10 min.

Now, for 8 miles, it would be 85*8/10 = 68 minutes

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

the answer for this question is 38