bmwhype Posted November 24, 2007 Share Posted November 24, 2007 Two airplanes are 300 miles apart and flying directly toward each other. One is flying at 200 miles per hour, and the other at 160 miles per hour. How long will it take for the two planes to meet? a) 36 min. b) 50 min. c) 1 hour and 12 min. d) 1 hour and 40 min. e) 1 hour and 41 min. Quote Link to comment Share on other sites More sharing options...
tublai Posted November 24, 2007 Share Posted November 24, 2007 Compund speed = 200 + 160 = 360 miles/hr ( why add? flying directly toward each other ) Distance = 300 miles Time = 300 / 360 = 50 mins Quote Link to comment Share on other sites More sharing options...
chandak_anand Posted November 24, 2007 Share Posted November 24, 2007 They are flying each other at 360(200 + 160) Miles per hour. So when they meet they will cover the distance of 300Miles for which they will take 300/360 = 50 Mins so B Quote Link to comment Share on other sites More sharing options...
anil007 Posted November 24, 2007 Share Posted November 24, 2007 same approach Quote Link to comment Share on other sites More sharing options...
bmwhype Posted November 30, 2007 Author Share Posted November 30, 2007 They are flying each other at 360(200 + 160) Miles per hour. So when they meet they will cover the distance of 300Miles for which they will take 300/360 = 50 Mins so B OA is B Quote Link to comment Share on other sites More sharing options...
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