A plane flying north at 500 mph passes over a city at 12 noon. a plane flying east at the sae altitude passes over the same city at 12:30 P.M. The plane is flying east at 400 mph. To the nearest hundred miles, how far apart the two planes at 2 P.M.? `600\ m i l e s` b. `1000\ m i l e s` c. `1100\ m i l e s` d. `1200\ m i l e s` e. `1300\ m i l e s`

A is 10 miles west of B. C is 30 miles north of B. D is 20 miles east of C. what is the distance from A to D? a. 10 miles b. 30 m i l e s c. 10 sqrt(10) m i l e s d. 10 sqrt(13) m i l e s e. 30 sqrt(2) m i l e s

An aeroplane flies twice as fast as a train which covers 60 miles in 80 minutes. What distance will the aeroplane cover in 20 minutes? 30 m i l e s b. 35 m i l e s c. 40 m i l e s d. 50 m i l e s

A train travel at an average of 50 mile per hour for 2 1/2 hours and then travels to a speed of 70 miles per hour for 1 1/2 hors. How far did the train travel in the entire 4 hours? 120 m i l e s b. 200 m i l e s c. 10 m i l e s d. 230 m i l e s

On return from a business trip Mr. X was to be picked up from the railway station by his coachman. However, his meeting having finished before schedule, he left his destination earlier by catching an earlier train as a result of which he arrived 2 hours early. Immediately on arrival he ring up home for the coach and was told that it had must left in order to be exactly in tie for the train by which he was scheduled to come. To save time he started walking home ward a 4 mph. On the way he met the coachman who brought him home an hour before schedule. How far is Mr. Xs house from the railway station? 12 m i l e s b. 16 m i l e s c. 8 m i l e s d. 24 m i l e s

A plane is to fly due north. The speed of the plane relative to the air is 200 km//h , and the wind is blowing from west to east at 90 km//h .

Let R be the relation over the set of straight lines in a plane such that l R m iff l bot m . Then R is :