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2015-09-18T16:59:01+08:00

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           A             B
d    |   80t           92t
t     |     t              t
r     |   80            92

473 = 80t + 92t
473 = 172t
473/172 = t
2 3/4 = t
2 hrs 45 mins = t

They will be apart in 2 and 3/4 hours or 2 hours and 45 minutes.
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