Question
A person sees a train passing over 6 km long bridge. The
length of the train is half that of bridge if the train clears the bridge in 5 mins. What is the speed of the train?Solution
Distance covered in 5/60 hours = (6 + 6/2) = 9 km Distance covered in 1 hour = 9 x (60/5) = 108 km So, speed of the train = 108 km/hr
147      138       120      93      ?      12
...Complete the series choosing the missing number.
8, 13, 20, ____, 40.
48Â Â Â Â 61 Â Â Â Â 76 Â Â Â Â 94Â Â Â Â 116 Â Â Â Â Â ?
? + (55)2 = (140)2 – (80)2 – 6278
0Â Â Â Â 2Â Â Â Â 10Â Â Â Â 24Â Â Â Â Â 68Â Â Â Â Â 120
...520Â Â 79Â Â 440Â Â 151Â Â Â 376Â Â Â ?
100Â Â Â 180Â Â Â 294Â Â Â 448Â Â Â 648Â Â Â ?
0Â Â Â Â Â Â 2 Â Â Â Â Â Â Â 6Â Â Â Â Â Â 12 Â Â Â Â Â Â 20Â Â Â Â Â Â Â ?
...6, 17, 21, 47, ?, 107
Select the number from among the given options that can replace the question mark (?) in the following series.
64, 60, 52, 40, ?, 4
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