J4. Arrival Time
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Fiona commutes to work each day. If there is no rush-hour traffic,
her commute time is 2 hours. However, there is often rush-hour traffic.
Specifically, rush-hour traffic occurs from 07:00 (7am) until 10:00
(10am) in the morning and 15:00 (3pm) until 19:00 (7pm) in the
afternoon. During rush-hour traffic, her speed is reduced by half.
She leaves either on the hour (at XX:00), 20 minutes past the hour
(at XX:20), or 40 minutes past the hour (at XX:40).
Given Fiona’s departure time, at what time does she arrive at
work?
The input will be one line, which contains an expression of the form
HH:MM, where HH is
one of the 24 starting hours (00, 01, \(\ldots\), 23) and
MM is one of the three possible departure
minute times (00, 20, 40).
Output the time of Fiona’s arrival, in the form
HH:MM.
05:0007:00Fiona does not encounter any rush-hour traffic, and leaving at 5am,
she arrives at exactly 7am.
07:0010:30Fiona drives for 3 hours in rush-hour traffic, but only travels as
far as she normally would after driving for 1.5 hours. During the final
30 minutes (0.5 hours) she is driving in non-rush-hour traffic.
23:2001:20Fiona leaves at 11:20pm, and with non-rush-hour traffic, it takes two
hours to travel, so she arrives at 1:20am the next day.
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J4. Arrival Time
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J4. Arrival Time