Question
1800 metres long train crosses a man who is moving in
the same direction with a certain speed, in 18 seconds. If the same train can cross a tree in 9 seconds with the same speed, then find the speed of the man.Solution
Speed of train = 1800/9 = 200 m/sec Let the speed of the man be ‘s’ m/sec Relative speed of the train = (200 – s) m/sec According to the question, (200 – s) = 1800/18 Or, s = 200 – 100 = 100 Therefore, speed of the man = 100 m/sec
31, 60, 118, 234, 466, ?
64, 80, 120, 210, ?, 945
106, 124, 88, 142, ?, 160
- What will come in place of (?) in the given number series.
1, 2, 6, 21, 88, ? 654, 647, 633, 612, 584, ?
8Â Â Â 8Â Â Â 12Â Â Â 24Â Â Â Â 60Â Â Â Â Â ?
What will come in place of the question mark (?) in the following series?
1223, ?, 1308, 1553, 1393, 1638
What will come in place of the question mark (?) in the following series?
60, 94, 184, 464, 1388, ?
4, 12, 36, 108, ?, 396
37, 49, 63, ?, 97, 117