At 1:00 p.m. a car leaves St. Louis for Chicago, traveling at a constant speed of 65 miles per hour. At 2:00 p.m. a truck leaves Chicago for St. Louis, traveling at a constant speed of 55 miles per hour. If it is a 305-mile drive between St. Louis and Chicago, at what time will the car and truck pass each other?

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Answers

2014-02-26T17:53:50+08:00
Rounding it off will be probably 3:00 PM.
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2014-02-27T23:18:20+08:00
At 2pm, distance is 305-65=240 miles. after 2pm, distance gets closer by (65+55)=120 mi/h. 

Hence it would take 240/120=2 more hours. 

They will pass at 2+2=4 pm.
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