I would set D = 816000 and then solve
BC is congruent to DC or BA is congruent to DA, depending on what point marks the intersection point of the two lines.
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Since 3:00 a.m is three hours after midnight, the variable h in the function would be three.
T(h) = -15 + 3h step 1 - write the equation
T(3) = -15 + 3(3) step 2 - plug in h, which is three
T(3) = -15 + 9 step 3 - simplify the expression
T(3) = -6