question:A train 280 m long, running with a speed of 63 km/hr will pass a tree in?
Options:
(A) 11
(B) 16
(C) 18
(D) 10
(E) 14
answer:(B)
Stream of consciousness:Speed = 63 * 5/18 = 35/2 m/sec
Time taken = 280 * 2/35 = 16 sec


question:One copy machine can make 20 copies a minute, and a second copy machine makes 10 copies a minute. If the two copiers work together, how long would it take them to make 900 copies?
Options:
(A) 10 minutes
(B) 20 minutes
(C) 25 minutes
(D) 30 minutes
(E) 35 minutes
answer:(D)
Stream of consciousness:Total work done by both machines in a minute = 20 + 10 = 30 copies
Total number of copies required = 900
Time = 900/30 = 30 mins


question:A train 540 meters long is running with a speed of 54 kmph. The time taken by it to cross a tunnel 180 meters long is?
Options:
(A) 33
(B) 77
(C) 48
(D) 99
(E) 22
answer:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
(C)
Stream of consciousness:D = 540 + 180 = 720
S = 54 * 5/18 = 15 mps
T = 720/15 = 48 se