PP一題，尋答

yaoyao99 · 发表于 2006-5-23 00:39:00

5 minutes = 5/60 hours = 1/12 hours

20(miles/hour) * 1/12 hours = distance cyclist travelled within 5 minutes = 5/3 miles
the time it'll take the hiker to catch up = 5/3 miles / 4(miles/hour) = 5/12 hours = 25 minutes

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yaoyao99 · 发表于 2006-5-27 03:41:00

Oops, the answer should be 20

http://forum.chasedream.com/dispbbs.asp?BoardID=22&ID=138780

PP一題，尋答

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