Question
Train ‘A’ running with a speed of 108 km/hr crosses
a vertical pole in 6 seconds. Find the approx. time taken by the train ‘A’ to cross a train ‘B’ whose length is 120 metres less than that of train ‘A’ and whose speed is 1/10 more than that of train ‘A’ if both are running in opposite direction.Solution
Speed of train ‘A’ = 108 × (5/18) = 30 m/sec Length of train ‘A’ = 30 × 6 = 180 metres Length of train ‘B’ = 180 – 120 = 60 metres Speed of train ‘B’ = 30 + (30/10) = 33 m/sec Required time taken = (180 + 60)/(30 + 33) = 3.80 = 4 seconds
- 3, 6, 2, 8, 2.4, 9.6
Find the wrong number, in the given number series,
4, 10, 20, 40, 100, 250, 500
 -2, 0, 8, 32, 64, 66
33Â Â Â Â 34Â Â Â 37Â Â Â 42Â Â Â 48Â Â Â 58
32, 41, 66, 115, 236, 415
850, 849, 841, 814, 750, 688
- Find the wrong number in the given number series.
600, 539, 488, 447, 408, 395 Â 44, 57, 81, 119, 170, 234, 311.
- Find the wrong number in the given number series.
6, 12, 36, 108, 540, 3240 125, 600, 2400, 7200, 14400