1. D 2. A 3. D 4. C 5. D 6. A 7. A 8. A 9. B 10.A 11.A 12.D 13.C 14.B 15.B 16.D 17.D 18.C 19.D 20.D 21.B 22.A 23.A 24. Answer:Option D Explanation: Speed= 60 x 5 m/sec = 50 m/sec. 18 3 Length of the train = Speed x !ime" = 50 x # m = 150 m. 3 25. Answer:Option B Explanation: !his is a simp$e a$ternating addition and s%&traction series. 'n the first pattern( 3 is added) in the second( 2 is s%&tracted.