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Svetlana runs a 20 mile race. At what time did she finish [#permalink]
19 Aug 2004, 20:21

Svetlana runs a 20 mile race. At what time did she finish the race?

1. She started the race at 8:05AM and her average speed for the first 10 miles of the race was 8 miles per hour.

2.She had completed half of the amount of running time at 9:20AM and had completed 80% of running time at 10:05AM.

One explanation I saw was that the answer was C, but
I'd like to know why it couldn't just be B instead, since, if we determine
that 30% of the running time consisted of 45 mins., we can just determine what 20% of the running time would be and add it to the 80% time point.
?