Shrija Roy wrote:

2. Running on a 10-mile loop in the same direction, Sue ran at a constant rate of 8 miles per hour and Rob ran at a

constant rate of 6 miles per hour. If they began running at the same point on the loop, how many hours later did

Sue complete exactly 1 more lap than Rob?

(A) 3

(B) 4

(C) 5

(D) 6

(E) 7

Rewriting the question: How many hours later was Sue 10 miles ahead of Rob.

Say this happens x hours later.

So;

distance covered by Sue in x hours -distance covered by Rob in x hours = 10 miles

or

8 \times x - 6 \times x =10. Solving for x;

x=5 hours.

Hence option C is correct!
_________________

Sandy

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