Stephen had a 10:00 a.m. appointment $60 \mathrm{~km}$ from his home. He averaged $80 \mathrm{~km} / \mathrm{h}$ for the trip and arrived 20 minutes late for the appointment. At what time did he leave his home?
(A) 9:35 a.m.
(B) 9:15 a.m.
(C) 8:40 a.m.
(D) 9:00 a.m.
(E) 9:20 a.m.
Stephen had a 10:00 a.m. appointment $60 \mathrm{~km}$ from his home. He averaged $80 \mathrm{~km} / \mathrm{h}$ for the trip and arrived 20 minutes late for the appointment. At what time did he leave his home?
(A) 9:35 a.m.
(B) 9:15 a.m.
(C) 8:40 a.m.
(D) 9:00 a.m.
(E) 9:20 a.m.

## Solution

If Stephen averaged $80 \mathrm{~km} / \mathrm{h}$ for a trip which was $60 \mathrm{~km}$ in length, it must have taken him 45 minutes to make the trip.

If the entire trip took 45 minutes and he arrived 20 minutes late he must have left home at 9:35 a.m.

ANSWER: (A)