1 min = 60 sec
1h = 60 min
1h = 60 min = 60 ∙ 60 sec = 3600 sec
1 h 18 min 27 sec = 1 + 18 / 60 + 27 / 3600 =
3600 / 3600 + 18 ∙ 60 / 60 ∙ 60 + 27 / 3600 =
3600 / 3600 + 1080 / 3600 + 27 / 3600 = 4707 / 3600 h
average speed = distamce / time = 26.2 mi / ( 4707 / 3600 ) h =
26.2 ∙ 3600 mi / 4707 h = 94320 mi / 4707 h = 20.038241 mi / h
average speed approximately = 20 mi / h
The record for the boston Marathon wheelchair division is 1 hour, 18 minutes, and 27 second long.
The boston marathon is 26.2 miles long. What was the average speed of the record winner of the wheelchair division?
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