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Bunuel
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At 11:00, Ryan drove 100 miles (2 x 50)
At 5:30, Ryan drove

6.5 x 50 + 100
425

At 5:30 Grace drove
70 x 6.5
455
=425 + 455 = 880

Therefore, Ryan and Grace drove 880 miles apart at 5:30 p.m.

Answer: C
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Bunuel
Two trucks are parked at Charissa's Diner. Ryan leaves the diner, at 50 miles per hour, heading due east at 9 a.m. in one of the trucks. Two hours later Grace takes off, at 70 miles per hour, in the other truck heading due west. How far apart will Ryan and Grace be at 5:30 p.m.?

A. 1020 miles
B. 920 miles
C. 880 miles
D. 700 miles
E. 570 miles

Distance traveled by Ryan will be 8.5*50 = 425 miles
Distance traveled by Grace will be 6.5*70 = 455 miles

Total distance between the 2 trucks will be 425 + 455 = 880 miles...

Answer must be (C) 880 miles.
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Other way of solving this problem than those explained above, is thinking it as the sum of the speeds during the time both are driving (sum, not difference, as they are driving opposite directions) by that time and then add the distance that Ryan drove during the first 2 hs.

Total distance apart from each other at 5:30pm = (50+70) mph * 6.5h + 50 mph * 2h = 780 m + 100 m = 880 miles

Option C.
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